I saw a couple of Caribbean reef sharks during the safety stop at the
Blue Hole.  They swam by to check us out and were gone again.  Then
again it might have been one since I never saw them both at the same time.

Definitely curious and did not hand around long enough to approach.

http://www.bluedive.com/gallery.html

http://www.bluedive.com/gallery2.html

http://www.belizetravelcentral.com/turneffe_diving.html

This site has a picture of a shark near a stalactite, towards the bottom of
the page:
http://www.scubabelize.com/Blue%20hole.htm

http://www.belizeexplorer.com/cgi-local/explorer.cgi?
db=explorer&uid=default&Category=Natural+Attractions&view_records=1&nh=15&mh
=1#photos

http://home.student.uva.nl/kristian.krig/Go__/bluehole/bluehole.html

http://www.scubadivingbelize.net/blu.html

Warning slow load:  http://ist-socrates.berkeley.edu/~khernst/Belize.html

This page has a picture of the stalactites and divers.  I don't know where
the shark picture was taken but don't believe it is the Blue Hole:
http://www.ambergriscaye.com/pages/town/diver.html  Don't you just love the
excellent position the divers have taken in the water column? snort.

Here's some less than spectacular video footage:
http://www.oceanfootage.com/stockfootage/Blue+Hole//?DVfSESSCKIE=5cda83704d60309
6fde144219f0384868a399cb5

Here is an excerpt from a recent post by Gaz Cooper about diving the Blue
Hole:

Nearly all the boats that dive the Blue Hole from San Pedro see the sharks,
and the reason for this is that they get to the Blue Hole FIRST before the
Aggressors and other large boats, resorts etc that are located in the area.
(make a mental note here that normally its the very experienced divers that
usually book the liveaboards and stay at the remoteAtoll resorts because
thats where the best diving in Belize can usually be found)

Being the first to dive the Blue Hole affords them better visability since
the first group to dive the Blue Hole gets the best vis, the reason for this
is, as you decend it causes the silt to dislodge as the bubbles rise and
releases the silt causing visability to become reduced.
When you consider that San Pedro sends up to 5 boats a day to the Blue Hole
you can understand why those that dive it later in the morning under the
pretext (Lets wait till the san pedro boats leave so its less busy) dive a
site that has had probably 50 divers through it already before they get the
chance to dive it.
This puts them at a distinct disadvantage as to the quality of the dive
especially in the area of visability since 40-50 divers and there bubbles
will reduce visability by up to 50% in some cases, in addition there are the
Sharks.

The Sharks will sometimes follow you throughout the dive but are mainly
ultilized at the end of the dive since you have an extended safety stop of
10 minutes or so and while waiting out that time on the sandy ledge located
at 15ft you are buzzed and entertained by up to 30 Caribbean Reef Sharks.
The sharks are enduced to come to the surface by baiting the water with
sardines this will bring them to the surface from the depths of the Blue
Hole and give the diver the opportunity to view these magnificent creatures
during the safety stop.

The liveaboards do not bait the water nor the local resorts and if this is
not done the likelyhood of seeing any sharks is reduced by 90% so you can
clearly see that most divers that dive the Blue Hole from a liveabord or an
Atoll resort will have a far inferior dive due to these reasons.

I realize I got a bit carried away with the URL's above but at least one of
them has a picture of the stalactites and a shark.  As for my own
experiences, I've seen them too approachable, skittish, curious, too curious
and uninterested.  :^)

My last dive in the Hole, I saw only one shark, every other time, I've seen
many.  My very first dive off the boat into the Hole, as I splashed, I
looked down and there was a great mutha gliding past, just beneath me.  On
my second last dive in the Hole, I spied a real beauty parallel to me in the
water about 15-20 feet away.  I was shining my light all up and down its
length admiringly when suddenly it turned towards me.  I quickly doused my
light and swam off after my buddies.  But my spidey senses were tingling . .
.so I looked behind me and sure enough . . .there it came . . .ever so
slowly but closer, closer, always closer . . .

By this time, I'd gone vertical and eyes big as saucers waited for the taste
bite . . . which didn't come.  The shark slid ever so slowly just below me,
first its snout, then its eyes, its gills, its fin . . .As a measure of how
I was ever so slightly narced, I actually extended my right fin tip to see
if I could touch it . . .I mean, how close was it really?  And then, as
suddenly as that, it was gone.  I breathed my first full exhalation about
then, turned back to my buddies who had also stopped to watch and we
continued our ascent to the safety stop as if nothing unusual had occurred.
At the safety-stop, we were joined by 5 or 6 more that circled within a few
feet of us but didn't bother anyone more than that.