http://www.odditycentral.com/pics/crazy-halloween-traditions-underwater-pumpkin-carving.html#more-19844

Crazy Halloween Traditions: Underwater Pumpkin Carving
By Spooky on October 6th, 2010 Category: Events, Pics
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Every Halloween, a group of pumpkin-carving 
enthusiasts take their pumpkins and carving tools 
for a session of pumpkin carving - underwater.

It might sound like a weird event, but underwater 
pumpkin carving is pretty common in the US, with 
several competitions being organized in Florida, 
South Carolina, Lake Tahoe or Pennsylvania. 
Contestants put on their diving gear and drop 
down to a depth of less than 30 feet, where they 
try to carve the most intricate jack-o’lanters, 
and claim the top spots. All the gear is supplied 
by the organizers, so contestants need only bring 
their talent and inspiration.

While it may sound like a fun thing to do, carving 
a pumpkin underwater is a pretty difficult task, 
considering the buoyancy of the pumpkin (at least
until you cut the lid off) and Newton’s third law 
of motion (for every action there is an equal and 
opposite reaction).

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http://www.environmentalgraffiti.com/food-and-drink/news-thrill-underwater-pumpkin-carving
Environmental Grafiti web site
(pictures, trivia & video

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http://www.breakyourduck.com/underwater-pumpkin-carving.html
Instructions for how to carve pumpkins underwater.
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http://www.mauioceancenter.com/
Home page for the Maui Ocean Center