Helmet of the Deep

The Helmet of the Deep is used to dive underwater. Wearing it is required to be able to go underwater, but once there the helmet can be removed. However, without it players will take 5 times 20 Drowning damage kicking in after four seconds of standing still. It is useful out of the depths, too: some monsters, like Water Elementals, use drowning damage attacks. There is a 5,000 gp deposit for the helmet. You must be a member of the Explorer Society (beginning of the Spoiler Section Explorer Society Quest The Undersea Kingdom