http://swissbaync5d7ykaz7dh7v4qjrb4gmen5aj3bogxrcgbb43ij34bjuyd.onion/pdf/Books/Survival/Medicine/oddsnends.htm
Interestingly, only one site, Belize, is convenient to North American divers. All the
sites are accessible to scuba enthusiasts except, of course, the deep ocean vents,
reachable only by submarine (and the only site not personally visited by the author).