The early submarine (the Turtle) had a screw device to drill into the ship, and a "time bomb" explosive spar (torpedo, mine) that would be attached to the hull below water.
Bushnell's submarine was made of wood.
Bushnell built his submarine, the "Turtle", in early 1776 and first used it in September that year.
david bushnell
David Bushnell
David Bushnell
It was invented by David Bushnell.
David Bushnell
David Bushnell
David Bushnell was ingenious in inventing a submarine.......which today one of our most valuable Naval vessels.
The first attack was made by Sgt Lee, piloting the sub TURTLE, built by David Bushnell in 1776 during the Revolutionary War.
David Bushnell .
David Bushnell