Encased in the deep blue of the ocean, Lim Anqi, a freediver, slowly sinks into the silence of the waters.

It's probably five times deeper than the deepest part of your pool and roughly the inverted third storey of an HDB block. Three thousand years ago in Japan, the Ama - or woman divers - descended 20m in search of food. There was no scuba equipment then, just ancient humans suggesting that mermaids weren't a myth.