The Royal Navy has launched an investigation into claims adult videos were made by personnel from HM Naval Base Clyde.
The service is looking into suggestions that Lieutenant Claire Jenkins and her partner Liam Doddington, a leading seaman, made explicit content while both based at Faslane.
Lt Jenkins is understood to have commanded personnel on Astute-class submarine, HMS Artful.
A Royal Navy spokesperson said: "An investigation is underway and it would be inappropriate to comment further.
"Where personnel fail to act in accordance with our values and standards, we will not hesitate to take appropriate action."
HMNB Clyde is home to the core of the Submarine Service, including the UK's nuclear deterrent, as well as the new generation of hunter-killer submarines.
Cover image: PA.