Acaiá Cave

Acaia is a very special place, a flooded cave which is accessible through a small crack in the rocks, due to high humidity you need to be very careful when you go down and you have to crawl as the space is less than a meter tall. Not a place for the claustrophobic, but the reward is that water is phosphorescent thanks to the light from the underwater access. Input functions as a lung when the sea is moved, the waves enter the cave and the air is pushed out as a small canyon entrance slit. The process is reversed when the tide goes out, there's a water vacuum effect within the cave, even though there was not sun when I visited it was spectacular.