Guadalupe Great White Sharks in danger.

I started SCUBA diving and spear-fishing at Guadalupe Island in 1996, 5 years before we started shark diving there. It is during that time that we discovered the Great White Sharks that are aggregating at there. At first it was just the occasional encounter, mainly while spear-fishing, but over the years those encounters grew in frequency and it was not unheard of to see a GWS while SCUBA diving.  My first encounter with a GWS happened…

Sharks in a pool?

After the movie “Jaws” came out in 1975, a lot of people were afraid to even enter a pool or a bathtub. Who knew that one could actually find a shark in a pool?

Check out this story. A shark found in a swimming pool! According to an article in Florida’s “Sun Sentinel” Nicole Bonk found a 5 foot blacktip shark in a pool.  

Blacktip shark ©Martin Graf

 “Nicole Bonk was visiting friends at the Mariner’s Cay condo the week before last when she saw two boys carrying the five-foot blacktip shark, with hooks in its mouth, and dump it into the pool at around 11 p.m.”

She and her husband pulled the shark out and carried it to the Intracoastal Waterway, where her husband held the shark by the tail in the water so it could try to flush out the chlorinated pool water. Then they released it.

“We tried to revive him but he mostly likely did not live,” she said. “He was barely moving after the trauma. We did our best to try to save this creature.”

It’s really disturbing that these kids had so little regard for a living creature. I’m glad that Nicole Bonk and her husband tried to save the shark and hope that it survived. 

This story shows that human beings are both capable of cruelty and compassion. I’m glad that the “Sun Sentinel” focused it’s article on those issues and not on trying to scare people into thinking they have to be afraid to enter a pool.

I hope that they find the kids who did this and teach them that this is not acceptable behavior.

She reported the incident to the Florida Fish and Wildlife Conservation Commission, but no officers arrived until the following morning.

“These two kids, they came back from fishing and threw this half-dead creature into the pool as a prank,” she said. “They left the shark in the pool to die. I think they’re terrible children because it’s animal cruelty.”

The wildlife commission is investigating the incident and attempting to find evidence from video security cameras around the pool.
Martin Graf
CEO Shark Diver 
About Shark Diver. As a global leader in commercial shark diving and conservation initiatives Shark Diver has spent the past decade engaged for sharks around the world. Our blog highlights all aspects of both of these dynamic and shifting worlds. You can reach us directly at

Science Expedition to Guadalupe Island

I booked the trip to Isla Guadalupe (Guadalupe Island) with Shark Diver of San Diego to fulfill a long held desire – since reading Jacques-Yves Cousteau’s “The Shark” and meeting his son in San Diego when I was a boy. And, in every way possible, this trip exceeded my expectations owing to the efforts of an outstanding Shark Diver team (particularly Martin Graf and Cindy Michaels), the Guest Marine Researcher Nicole Nasby Lucas, a fantastic Horizon crew, and great group of fellow shark divers. This is a must do in my opinion for anyone with a passion, interest or bucket list item relating to Great White Sharks – it’s fun, safe and amazing. Many details follow.

The Main Event:
I don’t want to bury the lead, so I’ll get right to our guests of honor. The Great White Sharks are impressive, majestic, and beautiful. They move by the twin cages, quite closely, at a stately pace, and look at the folks in the cage with large deep blue eyes; and, they appear utterly calm and in command. They make passes at the two bait carcasses off the stern, sometimes lazily and on occasion quite quickly. We were fortunate enough to witness a breach on one occasion – a male, who had previously made half-hearted passes at the bait, disappeared, the emerged from deep below the boat, under the cages, at speed, and hit the bait vertically from below, taking himself halfway out of the water – to the astonishment, screams and overwhelming joy of everyone aboard.

The visibility, typically, is very good at Isla Guadalupe, so the sun penetrates deep into the water and the boat casts a long shadow into the depths. Often our first sightings each time into the cage(s) were of the dark silhouette emerging from the shadow cast by the boat, coming up slowly from below and then circling the cages, bait and boat for some time before silently disappearing into the shadows again. Though each of us kept eyes peeled in all directions, it was amazing how frequently we were taken by surprise by a shark suddenly appearing. On deck, between dives, the crew is very experienced and keen eyed; and, they will call out “White Shark” as they approach, usually well before any guests see them. From above or below it is mesmerizing, and difficult to turn away.

Isla Guadalupe:
There are a few places worldwide to see Great White Sharks with predictability. Both South Africa and the Farallon Islands offer this opportunity; but, both have limited underwater visibility and challenging water temperatures. Isla Guadalupe has better water clarity, 100 foot visibility, and weather, and very few (we saw only three other) boats, some distance away. Unlike other locations, Isla Guadalupe will not force you to deal with cold and murky water, crowded boats and cages, quick “in and out” quick thrill experiences, etc. You will have days on the dive site, in relatively warm and very clear water, and good weather.

#153 he needs a name! You can name him by clicking here

Isla Guadalupe is a designated Bio Sphere, a marine sanctuary. It sits about 200 miles southwest of San Diego. It is made up of volcanic remnants and has a stark beauty, with tall, steep cliffs diving hundreds of feet down to sea. There are large populations of, and rookeries for, elephant seals, sea lions – all of which you are very likely to see, with approaches to boat on occasion.

Typically, though as Martin notes there are no hard and fast rules with White Sharks, they tell us the males will show up in earlier months – e.g., July, August, and September – and in greater numbers. And the typically October and November are when they have female sightings – the females being fewer but much larger than the males. Also, typically, the wetter weather comes later in the year, with the Pacific hurricane / wet season; but, this too is not always the case.

The Drive Out:
It is a long trip out to, and back from Isla Guadalupe from / to San Diego. It was some eight hours from San Diego to Ensenada Mexico, where we docked to have passports checked, and then a long 18 +/- hours to Isla Guadalupe. Note that the return trip is the same itinerary, in reverse, with a stop in Ensenada before entering U.S. waters. Along the way out to Guadalupe, a large pod of dolphins escorted us. The sea can often be a bit rough to quite rough, with good swells causing a fair bit of roll onboard. Owing to timing, much of the initial leg is spent hanging out in main cabin getting to know fellow divers, with folks eventually heading to their beds – sleep and good anti motion sickness remedies work well. Most folks used some combination of ear patch and oral medication. It’s a long drive, so be smart and just bring your meds.

The Boat:
You won’t “Need bigger boat”  The MV Horizon the Horizon is roughly 80 feet long with 8 state rooms and several bunks. There are two restrooms and showers that are shared by all. The accommodations (two persons to a room with curtain for privacy and in bunks) are not lux, but they are nice, and you won’t care anyway  The Horizon is used only as diving vessel; and that’s all season long. They determine who bunks together once everyone arrives in San Diego, based on number of couples, individual travelers, etc. The sleeping quarters are below,, and the main cabin contains the galley and a series of booths along each side used for dining and spending time together with travelers in route or between dives. Net / net, this is a large and comfortable boat.

The Cages:
There are two, kept on deck astern for the trip and each night when diving is completed. For each day’s diving, each is suspended off, but affixed to, the stern at the surface (that is, they do not sink below) – so you simply climb down a ladder and into the cage (easy); and each easily holds four divers. One cage is aft port, one aft starboard. You will alternate each dive, so that everyone has plenty of time in each cage.

 The Dives:
The divers are assigned to two teams. Each team dives for an hour, and then rests and re-hydrates for an hour while the alternate team dives. Each team has four people in each cage, and the team alternates cages each time, so everyone gets to try both cages and gets plenty of dive time and rest. There were a couple days of early open diving as well – starting just after sunrise – during which anyone who preferred could climb into either cage.

The crew will size you for suits, equipment, weights, and Martin himself oriented each of us to breathing via air hose and made sure we comfortable before we stepped fully down into the cage.
Safety is primary and at no point was anything but utterly assured all was well and well in control. No divers are ever permitted out of the cages – for the sake of the sharks, the marine preserve, as well as the divers. You are completely safe at all times. There were folks of all ages, bith genders, and widely varying experience levels. Past trips have included folks in their 60’s and 70’s, and quite young divers as well. The always amazing Cindy at Shark Diver can advise on particulars.

Breathing with the hookah system is easy – no metal tanks to strap on, simply a long hose that goes from on deck tank system to each diver’s regulator (mouthpiece through which you breathe). So, if you’ve ever snorkeled and used a mask, you’ll be just fine. The cages are beyond sturdy, offer complete visibility around, above and below, and are plenty large enough for each set of divers.

The Purpose:
In addition to the opportunity provided to guests to see these amazing creatures, each shark observed is photographed (Martin, Nicole and the divers get to participate in this) and compared to a database of previously observed sharks. New sharks are named and tracked in the database each successive year. This is a joint effort between the Marine Conservation Science Institute (MCSI) and Shark Diver. 

#172 Freya a shark that was newly named this season.

Newly identified sharks on a particular dive are named by the people on the dive in a bidding process (proceeds of which go to the MCSI and shark research effort). On a side note, I was fortunate enough from a 2014 dive with Shark Diver to name one – Hooper (after the Richard Dreyfuss oceanographer character in Jaws) – great fun and a great way to support the cause.

# 159 Hooper

Isla Guadalupe is home to a marine preserve and a research station manned by a researcher named Mauricio – who will visit the Horizon and give an excellent presentation with Martin on Great White Sharks and the Isla Guadalupe Bio Sphere.

The Shark Diver Team:
Martin Graf, the CEO and dive leader, teacher, host is a deeply experienced and great guy. He is hands on, overseeing everything on the dives. He also gives talks and a presentation to the divers on Isla Guadalupe, Great White Sharks, and many experiences with both. If Nicole Nasby Lucas (again, researcher from MCSI) is leading Science Expedition, she, too, will give a fine presentation, talk. Both Martin and Nicole worked each evening on identified sharks seen from photographs taken during the day. All the reservations, logistics, arrangements, and care taking of the divers before and after is led by the excellent and omnipresent Cindy Michaels, their Director of Communications – Cindy was a rock star and took care of every question and need leading up to the trip.

The Horizon Crew:
In a word, excellent. Experienced captain, crew – professional, easy going, genuinely friendly, and they take care of anything you might need. I cannot say enough good things about the crew of the Horizon.

The Food:
As noted elsewhere, the food is outstanding. The quality and quantity of the meals is positively surprising and uniformly excellent. There is also beer and wine aboard. There are large and delicious breakfasts every morning cooked to order, excellent lunches (including Sashimi), and absolutely fantastic dinners, including prime rib near end of stay. The galley will account for you preferences and restrictions with no problem.

Thank you David Moore! We appreciate you taking the time to share your experience with us and our future divers. We are glad you enjoyed your expedition and hope to see you again on another shark trip.

Martin Graf
CEO Shark Diver

About Shark Diver. As a global leader in commercial shark diving and conservation initiatives Shark Diver has spent the past decade engaged for sharks around the world. Our blog highlights all aspects of both of these dynamic and shifting worlds. You can reach us directly at

Island Of The White Sharks

Do you want to know what it is like to come to Guadalupe Island and meet the Great White Sharks? Read the following trip report and look at the pictures from John Gunn and Katrien De Maertelaere who joined us at Guadalupe Island back in August.  

Island Of The White Sharks
As we boarded Horizon, the 80 foot long dive boat that would be our home for the next week, we had no idea of the adventures that lay ahead. Fulfilling a life long dream to dive with Great White Sharks, I was about to embark on a trip out to Guadalupe Island in Mexico. A rocky desolate island 150 miles west of Baja California, which is now recognized as the best place to dive with these wonderful creatures in crystal clear waters. Having recently spent time out at the Farallon Islands (The west coast’s other hub of Great White activity) I couldn’t wait to experience the magic of Guadalupe.

Shark Diver ( were our hosts and the crew of the Horizon greeted us warmly as we strolled past the monstrous steel shark cages out on deck and settled into our cosy sleeping quarters. The trip out to Guadalupe isn’t for the light hearted, a 36 hour trek in decent swells (and apparently we had it calm!) but the Horizon was a wonderful vessel and once we’d past through immigration in Ensenada, Mexico we were out in the open ocean, heading due west over some of the richest and biologically diverse stretches of water in the world. Within a couple of hours of leaving the Mexican mainland we were accompanied by a large group of Pilot Whales, who stayed with us for over an hour, breaching out of the water just a few feet from the boat. It was a wonderful start to what we were all hoping would be the adventure of a lifetime. 

After a bumpy couple of nights sleep, we awoke on the second morning to the sounds of clucking steel and rushed up on deck. The cages were slowly being lowered into the water, overshadowed by the towering, volcanic rock face of Guadalupe Island. It was quite a sight and it felt only right that one of the world’s largest congregations of Great White Sharks had chosen this alien rocky outpost as their hunting ground. After a quick but delicious cooked breakfast (the food on the entire trip was divine!) and an introduction to the cage rotations (we’d be tag teaming one hour in and one hour out of the cage for the next 2 days!) it was time to gear up and get diving!

I was part of the first rotation and with the bate lines floating next to the cages and chum being poured over the side of the boat, we anxiously waited for our first glimpse of the world’s oldest apex predator! The hour ticked by without an appearance and the next team of divers jumped in to try their luck. Within minutes we were startled by the soon to be familiar shout, ‘WHITE SHARK!’ as a huge dark shadow gracefully glided past the boat. I could only imagine the sight from below the surface.

There had been no need to panic! Our second dive of the day turned out to be one of the best dives of the entire trip. We were treated to 3 White Sharks, circling the cages for the full hour. The opportunity to see these animals up close in clear water was truly special. They’re both graceful and terrifying at the same time. A monster from your nightmares, that you can’t take your eyes off. The 14 foot sharks glided inches from the cage, ominously disappearing into the blue, before somehow re-appearing moments later from the completely opposite direction. While at first glance their eyes are black and sinister, a closer look reveals a soft light blue interior that focused in on the divers as the shark glides past. These guys were definitely checking us out!

As rotations merged into each other, the action never stopped and as we experienced more sharks, we were privileged to witness an array of different personalities that each gave a unique interaction. Shark Diver keep a log of all the White Sharks they encounter and name them, as a way of keeping track. Over time, we learned who was who; ‘Legend’ was a mid- sized feisty shark that would charge and breach for the bait, giving the topside divers and crew quite a show. ‘Johnny’ was a more relaxed but larger and proud shark and every now and then we’d be lucky enough to look down into the depths and see the infamous ‘Bruce’, a monstrous male White Shark circling below. 

From the surface, the water was so clear it was like watching the sharks swimming in a pool and from below, the 100+ foot visibility offered photo opportunities I’m yet to encounter anywhere in the world. On our last night we were treated to a fantastic presentation from a couple of local researchers (the only inhabitants on the island, with the exception of a small fishing community) from Pelagios Kakunja Marine Conservation, educating us on the vital science and research currently being done to understand more about the Guadalupe ecosystem and the best ways to protect it in the future. As well as the informative talk, the two researchers showed us a ‘deep sea monster’ that they’d found floating on the surface, a bizarre bottom dwelling creature that we figured out probably belonged to the ‘Frog Fish’ family. 

Finally, we were treated to up close GoPro footage of a recent Great White predication on an Elephant Seal at the island (only the third time such an attack had been caught on camera), before we all slunked down to our cabins beneath the waves and looked forward to the final morning of diving before our departure back to the mainland.

The final morning didn’t disappoint, as we were continuously circled by a large male shark called ‘Biteface’. At nearly 16 feet in length, he dwarfed the cage as he glided inches from the steel cage and our busy cameras! After lunch the cages were hoisted back onto the Horizon and we set pace at a steady 10 knots, back to San Diego. Within a few hours, just as the sun was setting, we were accompanied by a stunning group of breaching Dolphins, giving the entire group a great opportunity to reflect on this wonderfully rich and wild stretch of ocean and the trip of a lifetime.

Will I be returning to Guadalupe? Most certainly, but probably not before my passion for Sharks and underwater photography takes me to the Tiger Sharks of the Bahamas and the resident Bulls Sharks of Fiji. Take a bow Shark Diver, you well and truly delivered!

Thank you John and Katrien for coming out with us and writing this great report! It was a pleasure having you on board and we enjoyed introducing you to our “friends” at Guadalupe Island. We are looking forward to taking you to the Bahamas and Fiji for your next shark diving adventure!

Martin Graf
CEO Shark Diver

About Shark Diver. As a global leader in commercial shark diving and conservation initiatives Shark Diver has spent the past decade engaged for sharks around the world. Our blog highlights all aspects of both of these dynamic and shifting worlds. You can reach us directly at