New submarine technology to allow more women onboard

But some critics fear it will make mixed crews more likely to romp on board.

Women have only been ­allowed on subs since 2011 and there are just three officers serving ­beneath the waves – but female ratings will be able to join them soon.

Top brass feared high ­levels of dangerous gases on board the vessels could harm ­unborn babies conceived ­before or during missions.

But now the subs are to be fitted with special “clean air” filters to cut the risk.

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