2.5-foot Sea Bug Is Scariest Thing on Reddit Since Peaches Geldof Pics Adrian Chen · 03/29/10 07:58PM Here is a frightening thing for a frightening time. A 2.5-foot giant isopod that was found attached to a submersible robot. These actually exist, deep under the sea, where they feast on whale carcasses. Another terrifying angle, after the jump.