To build the diving bell, the spider first forms a web platform underwater, typically connected to a plant. Then it carries air bubbles down under the web, on the underside of its body. It releases the air bubbles under the web to gradually build a stable underwater air pocket -- the web keeps the air bubbles from rising to the surface. The spider ventures out to catch fish, tadpoles and other pond animals, and brings the prey back to the diving bell to eat it. It also mates, lays eggs and raises spiderlings in the bell.