Royal Marines are currently working on board HMS Duncan (Picture: Royal Navy).
Warship HMS Duncan is conducting NATO security patrols in the Mediterranean.
The Type 45 destroyer left Cartagena this week to take part in Operation Sea Guardian.
The aim of the operation is to combat illegal activities, mitigating security threats, including terrorism-related, in the region.
HMS Duncan is working alongside NATO maritime patrol aircraft, with members of its boarding team conducting visits to private and commercial vessels at sea.
This is to gather information on patterns of life and identify any security concerns.
Royal Marines from 42 Commando's Juliet Company have been trained to board and take control of boats as part of Duncan’s role in providing maritime security.
Lieutenant Max Chapman, said: "The Royal Marines boarding team offers the capability for the ship to conduct non-compliant boardings.
"My team are highly trained in the dangerous operations to gain access to and take control of vessels attempting to avoid interdiction.
“This is necessary to ensure the safe boardings of vessels suspected of conducting illegal smuggling or piracy operations.”
As part of her six-month deployment to the Mediterranean, HMS Duncan has worked with French and US aircraft carriers.
She has also worked alongside the Italian navy providing air defence to a major exercise and taken part in a Cypriot humanitarian exercise.