Armed with a wood chisel and a hammer, Sherman spent four hours carving a hole in the bottom of the plywood-and-fiberglass hull, which was now the submerged boat's top deck and visible to any passing vessels.

CNN: Shipwreck survivor recounts drama on high seas

Armed with a wood chisel and a hammer, Sherman spent four hours carving a hole in the bottom of the plywood-and-fiberglass hull, whch was now the submerged boat's top deck and visible to any passing vessels.

CNN: Shipwreck survivor recounts drama on high seas

Throughout history, humans have relied on wood and stone to shelter and protect themselves, and the chisel is one of the best tools to work those materials.

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