Shark attack! –No, not the sail!

Rafts are usually kept afloat by using any combination of buoyant materials such as wood, sealed barrels, or inflated air chambers. Rafts are an ancient mode of transport, and are not propelled by an engine. Rafts have been used to traverse water since the dawn of humanity. See also: George Raft, Reversible addition−fragmentation chain-transfer polymerization, Rafting, The Raft of the Medusa, Kon-Tiki expedition, and Raft (video game).