Marine Sound Signal

The D296 Marine Sound Signal is a hydrostatically operated, explosive device for improving communications from surface to submarine in difficult conditions. The D296 Marine Sound Signal produces an audible underwater signal at up to 1800 metres in still water. It can be deployed from ships or helicopters from heights of up to 150 metres above sea-level at indicated wind speeds up to 130 knots. The device explodes under hydrostatic pressure emitting a distinct signal clearly discernible by a submarine at depth. Operation is simple and several safety features are incorporated which reduce danger to personnel and craft. The signal is of robust, metal construction.