Dear Reader:
Visions of great whites breeching out of the ocean to gorge on helpless northern
  elephant seal pups captured my imagination, so I was thrilled when a group of
  friends decided to dive with great whites off Isla Guadalupe, Mexico, a 175-mile
  boat ride from San Diego to the island west of Baja California.  
On the second day, when a crewmember shouted “We’ve got shark!,” it was a welcome
  cry. We had been skunked our first day. My first view was a 15-foot female
  who cruised by the cage without the least bit of interest. But, I still found it
  thrilling as I endlessly clicked my camera shutter.  
Owners and captains Shane Slaughter and John Conniff turn their 80-ft. fishing
  boat, the MV Islander, into a shark diving craft between August and December.
  They run five-day diving charters –– using up two days in transit –– primarily for
  Patric Douglas’ Absolute Adventures, whose trip we had joined.  
After we boarded in San Diego and were directed randomly to cabins, Captain
  Shane introduced the seven-man crew and gave us an unusual safety briefing. He
  cautioned about walking around the deck after dark. Should a “man overboard”
  emergency occur, immediately toss debris like coffee cups and other garbage to
  create a chum drift line to direct the boat back to the overboard passenger.
We then motored 23 hours, an endless
rock and roll, with several divers
suffering degrees of seasickness.
Just after sunrise, the waters settled
as the 98-square mile island, rising to
4200 ft., came into view. Colorful red
volcanic layers are reminiscent of the
Grand Canyon. Freshwater springs support
a community of trees and plants –
– and goats, brought by early settlers,
who no longer live here. The crew lowered
two 4x10 ft wide cages with an
electronic boom near the stern, three
feet below the surface. A pump chummed
fish meal into the water, quickly
attracting scad mackerel and top smelt.
They floated two six-pound skipjacks on
buoys on each side of the cages. Shark
master Luke Tipple explained that they
keep the bait away from the two-foot
camera aperture around the cage. “The
sharks will come close and eyeball you,
but we don’t want them coming directly
toward the cage for the bait.” Yet for
three days the sharks, in 100 ft. visibility,
hardly came in for a close-up
view. When sharks were around, an hour
seemed like minutes; otherwise, waiting
in the cage got boring and cold.
And no hot shower after the dive. We
were asked to use the frigid freshwater
shower on the starboard side to conserve
water.
After being skunked the first day,
  I awoke to cloud cover and rolling
  seas the next morning. The 69-degree
  water was warmer than the air. Swimming
  gracefully, a 15-foot great white
  female with mating scars circled the
  boat. Then a smaller male appeared. My
  adrenaline rushed, but they had little
  interest in us. They continued circling
  until one launched into high gear
  to grab the skipjack. We all had the
  thrill of seeing four great whites on
  this day.  
To join the expedition, no dive
  certification is required, and no gear
  other than a mask, booties, and 7-mil
  wetsuit with hood. But, it takes some
  bravery, since one must jump from the boat through the four-foot open ceiling of
  the bouncing cage in the presence of great whites. Several experienced divers were
  badly bruised and one injured a foot after smashing into the side of the bucking
  cage opening.  
Four divers, in two shifts, were assigned to each of two cages every hour.
  We breathed surface-supplied compressed air through Scubapro regulators and wore
  harness-type vests pocketed with up to 40 pounds of weight so we could stand or sit in the cage.  Exiting the cage was
awkward, perhaps unsafe. I balanced on
metal steps of the rocking cage before
precariously stepping on top, then made
a giant stride onto the boat, with the
assistance of a wrist grab. Don’t get
out of the cage without their help,
lest you fall into 200 feet of water
dressed in a 40 pound weighted jacket,
with no emergency release. If a shark
breached the cage, they advised us to
drop weights (how?) and exit through
an emergency door opened by pulling a
yellow cable, though I never saw the
escape route on the other side.
Exiting the cage was
awkward, perhaps unsafe. I balanced on
metal steps of the rocking cage before
precariously stepping on top, then made
a giant stride onto the boat, with the
assistance of a wrist grab. Don’t get
out of the cage without their help,
lest you fall into 200 feet of water
dressed in a 40 pound weighted jacket,
with no emergency release. If a shark
breached the cage, they advised us to
drop weights (how?) and exit through
an emergency door opened by pulling a
yellow cable, though I never saw the
escape route on the other side.
The MV/Islander carries 30 passengers
  in two or three bunk cabins.
  The Absolute Adventure web site says
  the craft features “private air conditioned
  staterooms and washbasins, plus
  every other diving amenity you or your
  groups will need. . .If you’re looking for comfort, attention to detail, corporate
  incentive, and or a unique meeting/strategy space this is the vessel for you.”
  Baloney. The small, basic, musty cabins, without bathrooms or closets, had insufficient
  space for two divers to stand at the same time. The bunks were stacked
  so tightly I couldn’t sit on the bed. The small washbasin had inadequate light for
  shaving or inserting contact lenses. No soap, no waste basket, no housekeeping.
  And, you had to bring your own towel –– or find someone who brought two. A flight
  above the cabins, two bathrooms with temperamental hot-water showers that overflowed
  were shared by 17 divers plus the crew. Droppings on the staircase were
  evidence that we had a rat in the house.  
On the top deck, the padded compressor covering could be used to stretch out,
  or one could read in one of several deck chairs. Divers were welcomed into the
  well-equipped wheelhouse. A noisy compressor ran all night to fill the next day’s
  tanks. When the boat was running, the automatic pilot beeped continuously on the
  starboard side of the salon, interrupting the sleep of those in nearby cabins.  
Four leather-covered booths seated six passengers in the salon. Paul Grebetz
  prepared abundant, hearty and heavy cuisine, usually topped with rich gravy or
  garlic or butter. Several vegetarians who had made their restrictions known
  beforehand were unhappy that he served no protein options.  When a diver requested
  his steak rare on the first night,
  Grebetz said “I have too many sick
  people to do individual preparation.”
  But he soon became cordial and jovial.
  And, he baked a mean rhubarb and strawberry
  pie, fresh fruit turnovers, and
  bread. Mid-morning snacks were coffee
  cake or chocolate chip muffins, while
  late afternoon it was hot dogs with the
  works or pot stickers.
When a diver requested
  his steak rare on the first night,
  Grebetz said “I have too many sick
  people to do individual preparation.”
  But he soon became cordial and jovial.
  And, he baked a mean rhubarb and strawberry
  pie, fresh fruit turnovers, and
  bread. Mid-morning snacks were coffee
  cake or chocolate chip muffins, while
  late afternoon it was hot dogs with the
  works or pot stickers.  
Last October, Guadalupe was designated
  a biosphere preserve to preserve
  the great whites, whose jaws sell for
  $10,000 a pop on eBay. According to
  Shane, fishing boats were arriving with
  makeshift cages. Divers were swimming and photographing sharks outside cages. The Mexican government, wanting to protect
the shark, put regulations in place. Fishing is no longer allowed. The government
allegedly does not want sharks to associate diving boats and cages with people.
Our final day, viewing, as usual, began at 7:30 a.m. A single great white
  appeared at 10 a.m. For most of the day he swam aimlessly under the boat at a
  depth just out of camera focus range, a real tease.  
Having waited 25 years for the experience, I was excited to finally see great
  white sharks, though few and distant. Undercurrent readers have reported much
  better viewing on other trips and on other vessels, so whether the whites weren’t
  present, weren’t hungry, or our boat chased them away, I don’t know. So, unless
  your life isn’t complete until you see a great white underwater, you may be disappointed,
  not only in the action, but, if you’re on this boat, in the entire trip.
 — G.S.  
 Divers Compass: Patric Douglas of Absolute Adventures runs several
  5-day charters late summer and through early fall. The trip
  is $2500 and you’ll need to overnight in San Diego before and after
  the trip ... The Holiday Inn Bayside offers a free shuttle from and
  to the airport and while it’s across the street from the dock, it
  provides shuttle service so you don’t lug gear ... Special rates
  are around $100/night ... You can rent dive gear and wet suits from
  the Martin Graf Dive School for $50-$100. They pick up and deliver
  to the boat. Arrange in advance ... Our group of 17 was joined by
  a father and son, a former Everest climber, and two lovebirds from the Bay area.
  Absolute Adventures: www.sharkdiver.com 415-235-9410 or 888-405-3268
Divers Compass: Patric Douglas of Absolute Adventures runs several
  5-day charters late summer and through early fall. The trip
  is $2500 and you’ll need to overnight in San Diego before and after
  the trip ... The Holiday Inn Bayside offers a free shuttle from and
  to the airport and while it’s across the street from the dock, it
  provides shuttle service so you don’t lug gear ... Special rates
  are around $100/night ... You can rent dive gear and wet suits from
  the Martin Graf Dive School for $50-$100. They pick up and deliver
  to the boat. Arrange in advance ... Our group of 17 was joined by
  a father and son, a former Everest climber, and two lovebirds from the Bay area.
  Absolute Adventures: www.sharkdiver.com 415-235-9410 or 888-405-3268