| 摘要 |
A buoyant board for viewing underwater objects while an observer is lying in a prone position is of seamless, unitary construction, and has a viewing well extending through the body of the board that is integrally formed with the body. The body may be formed of rotomolded plastic. The board may have a vent to relieve excessive air pressure within the board, but is otherwise sealed so as to be substantially watertight. The board may also have a drain plug or valve that allows water that accumulates in the interior of the board as a result of condensation or leakage to be expelled. The upper end of the viewing well has a contoured shape that conforms generally to the contours of the human face. A transparent window is mounted at the lower end of the viewing well and may be recessed from the bottom of the board or mounted flush with the bottom of the board by providing a countersunk edge around the periphery of the lower end of the well.
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