Researchers put solid rocket engine to the test and find it could ignite and operate reliably under deep-sea pressure at depth of 200 metres.

Testing conducted by Chinese scientists has found that a solid rocket engine can ignite at 200 metres (656 feet) underwater – far deeper than submarine-launched missiles – suggesting new possibilities for deep-sea weapon systems. Ballistic missiles that can be launched from subs are central to strategic deterrence for nuclear powers – for example, the M51 used by France, America’s Trident system, and China’s Julang series. With these missiles on board, submarines, moving stealthily through deep…

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