There is no antivenin, which means that if you are stung, you will almost certainly be dead within minutes.
This snake may look less fearsome than the hooded cobra, but it is arguably more dangerous. It can strike very quickly and can also chase its victims at an incredible speed. It chooses to do this quite often without any provocation whatsoever.
Another ocean dweller to be wary of is the cone snail. It may not look like much, and you may easily mistake it for any other snail on the beach, but it is extremely deadly. Just one drop of its venom can kill twenty human adults.