Admiralty tug

Sea Alarm, formerly named Empire Ash
The tanker SS Ohio at the end of Operation Pedestal with its vital cargo of fuel, towed into Valetta Harbour, Malta with other tugs assisting 15 August 1942

Admiralty tugs were tugboats built for and operated by the Royal Navy. These were vessels built to Admiralty specifications and in specific classes during the First and Second World Wars. They were built to meet the Royal Navy's demand for auxiliary vessels and to supplement the civilian tugs requisitioned by the Admiralty for war service.