Sub-Lieutenant Rebecca Edwards (Picture: Enterprise News and Pictures)

A female officer accused of having sex on a nuclear submarine ‘wore the captain’s uniform’ while giving joke orders in the officers’ mess, it is claimed.

Sub-Lieutenant Rebecca Edwards, 25, is alleged to have had an ‘inappropriate relationship’ with the captain Commander Stuart Armstrong, 41, while submerged under the Atlantic.

More details emerged today about the ‘sex scandal’ which reportedly took place on one of the submarines built to carry Trident missiles.

She wore Cmdr Armstrong’s gold epaulettes during ‘boozy horseplay’ while giving joke orders to other officers on HMS Vigilant, the Daily Mail reports.

Five other officers on the sub threatened to resign in protest at what they said was a violation of the Navy’s ‘no touching’ rule, it is claimed.

Divorced Royal Navy submarine commander Stuart Armstrong, 41 (Picture: Enterprise News and Pictures)

The submarine had been headed to the United States to retrieve new Trident nuclear warheads when the initial reports emerged.

As allegations came to light, Sub-Lieutenant Edward’s family spoke to the Mail on Sunday.

Her grandfather Thomas Walker, 75, claimed she was a victim in this: ‘It is a bit poor really [for him to get involved with her]. He should have shown more responsibility towards a young girl like that.’

Both Edwards and Armstrong were removed from the submarine when it reached the US and an investigation is ongoing.

Rebecca Edwards, a Royal Navy weapons engineering sub-lieutenant (Picture: Enterprise News and Pictures)

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A source told the Sun: ‘Something seriously wrong happened on HMS Vigilant and we are trying to the the bottom of it.’

The submarine’s second-in-charge, Lt Cdr Michael Seal, is also alleged to have had sexual relations with another unnamed female officer.

Women were only permitted to serve on the vessels in 2011 when a ban was lifted.

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A Royal Navy spokesperson said: ‘We can confirm an investigation is underway, but it would be inappropriate to comment further at this stage.

‘Any allegations of wrongdoing are taken very seriously and will be dealt with appropriately.’

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