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Ah, I forgot about this one. Jorg told me about it earlier and posted it on his Shark-Freediving blog, so I am adding it here now too. The lagoon at San Alfonso del Mar in Chile, with the length of 1km, seems to be the biggest pool in the world. It is a pool with artificially filtered and circulated ocean water. More details on Jorg's website or at San Alfonso del Mar.
Google Maps link: San Alfonso, Chile - Google Maps
Super-Kamiokande is a neutrino observatory in Japan. The observatory was designed to search for proton decay, study solar and atmospheric neutrinos, and keep watch for supernovas in the Milky Way Galaxy.
Super-K is located 1,000 m underground in the Mozumi Mine, Japan. The detector consists of a cylindrical stainless steel tank 41.4 m tall and 39.3 m in diameter enclosing 50,000 tons of ultra-purified water. The tank volume is divided by a stainless steel superstructure into an inner detector (ID) region that is 33.8 m in diameter and 36.2 m in height and outer detector (OD) which consists of the remaining tank volume. Mounted on the superstructure are 11,146 photomultiplier tubes (PMT) 20 inches in diameter.
I found another good adept for this category. This one is a candidate for the world's deepest pool. I am not entirely sure about the real depth, but it looks like it is 36.2 m.
This one is not a diving pool, though just an aquarium tank, but with its depth of 25 meters and the fauna & flora in it, it would make a beautiful place for freedving! Did any of our German members ever attempted to get in for some show or demonstration? I bet it would be a great experience.
The 25 meters deep and 12 meters wide SeaLife AquaDom aquarium tank in Berlin, Germany: