I think they are at least a couple of pools that are about 100 feet deep, theres the SETT tank in the UK and Nemo 33 in Belgium. On the Nemo 33 website they mention something about caves and a pit but I'm not sure if it has an air pocket.
Did anyone here freedive in the nemo 33 yet? If I'm ever in Belgium it will definitely be the first stop on my list.
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