[azapa]

shadow, do it freediving, at the depths you mention it is quite safe and easy, and very rewarding if you learn correctly.

In fact, you have AMAZING luck because two of the worlds better freediving schools are on your doorstep: DiveFIT and performance freediving (PFI) look them up, they have regular courses there that will open your eyes and body to freedving in the best way you can imagine. The courses are not too expensive either.

good luck