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Her first creation wasn’t food, but shark repellent.

The Department of the Navy also worked with the Office of Strategic Services, the wartime precursor to the Central Intelligence Agency, to develop a shark repellent.

As well as supplying emergency packs for lifeboats around the world, the company produces equipment for use in war zones and peace-keeping operations including shark repellent and ballistic protective underwear dubbed 'blast boxers'.

He and those he served with slept above board, doused in shark repellent, armed with a sheath knife and life vest.

Dr Paul Scully-Power, a co-founder of the Little Ripper Group, said a life raft and emergency beacon can be dropped from the drone and the company is developing an electronic shark repellent.