SD Impulse

 Military Tug SD Impulse heading back to Faslane.

SD Impulse

 SD Impulse a military tug passing Loch Long after escorting a submarine into the Firth.

SD Moorfowl

SD MOORFOWL, described as a 'Powered Mooring Lighter', was built in 1989 by McTay Marine at Bromborough,seen here departing James Watt Dock after her winter refit. 

SD Dependable

SD Dependable and Resourceful at the Tail of the Bank awaiting the arrival of a Royal Navy ship to be escorted into Faslane.

SD Reliable

SD Reliable passing Greenock Ocean Terminal,

SD Oransay

Heading for the Great harbour Greenock.

SD Impetus and SD Resourceful

SD Nothern River

Sd Nothern river at the entrance to the Holy Loch

Sd Northern River

 SD Northern River is a large multi-purpose auxiliary ship operated by Serco Marine Services in support of the United Kingdom's Naval Service and is currently the largest ship operated by Serco Marine Services, both in terms of dimensions and gross tonnage.

Her duties involve target towing during naval training exercises, noise ranging and data gathering, as well as serving as a submarine escort.

SD Omagh

SD Omagh personnel carrier for the royal Navy.