GMS Headquarters in Tiverton, R.I.
The Givens raft, designed by NASA, relies upon a heavy, water-filled ballast. A flapper valve allows large amounts of water—hundreds of gallons—to enter the hemispheric chamber. This water provides the ballast that keeps the center of gravity constant, much like the thousands of pounds of lead keel used to stabilize sailboats. This design makes the raft nearly impossible to capsize.

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