Unusual or Unique Dives?

I just recently saw the articles on diving in a lead mine in Missouri, or a missile silo in Texas;
http://www.dtmag.com/dive-usa/BonneTerreMineMO.html
http://www.dtmag.com/dive-usa/TexasMissileSiloTX.html

So my question is, what OTHER unique or unusual dives are out there?
Please provide links (or thorough descriptions). Simplying replying, "West End" doesn't mean anything to anyone who has no idea what/where that is.

Ok, just remembered a couple myself;

World's Deepest Swimming Pool
http://www.nemo33.com/index_en/dive.html

Epcot's The Living Seas features a 6-million-gallon indoor aquarium with more than 65 species of marine life, including sharks, huge sea turtles, playful eagle rays and schools of colorful tropical fish. With guaranteed calm seas, no current and unlimited visibility.
http://disneyworld.disney.go.com/wdw/parks/tourDetail?id=EpcotDiveQuestTourPage&bhcp=1

Utah's Mile-High Saltwater Fish
http://www.dtmag.com/dive-usa/BelmontHotSpringsUT.html

Have you ever dived with Lil'Irish Temper? That might fall into the unusual.
But seriously, Cenote dives are pretty unique. Diving in a fresh water lake with millions of non-stinging jellyfish would be unusual. I'm sure this is only the tip of the iceberg.

Lil’ Irish
here
Cenotes
here
Jellyfish
here

Diving in the NASA WETF pool in a space suit.

http://www.mindspring.com/~divegeek/wetf.htm

Septic tanks, sewage treatment plants, over Challenger Deep and under a house just to mention a few.

Gary D.

A dive I once considered, did not attempt, and that is probably no longer possible (I believe the mountain is still closed to climbers because of volcanic activity) - diving the lake in the crater of Popocatepetl in Mexico, the 5th highest moutain in North America (the summit was just below 18,000 feet - don't know if the height of the mountain has changed as a result of the recent activity - and the crater lake was a few hundred feet below the crater rim).

Of course, there are other lakes perched high on volcanoes in other parts of the world. And Lake Titicaca in Peru is more than a couple of miles above sea level.

Stirling:

<snip>And Lake Titicaca in Peru is more than a couple of miles above sea level.

Click to expand...

Now that would be an unusual dive, and think of the dive t-shirt.




Gotta get me one of them.