No 1, 1901
Type: Submarine ;
Launched : 2 Oct 1901 ; Disposal date or year : Oct 1913
Disposal Details : Sold for scrap
Notes:

Used for training purposes at Fort Blockhouse. Sold for scrap in October 1913. It was while being towed to Portsmouth that she foundered and was lost, only to be rediscovered in April 1981. She was restored at Gosport Submarine Museum.

No 1, 1921
Type: Steam Tank ;
Displacement: 340 tons
Machinery notes: I.H.P. 250. ;
Notes:

NL Jan 1921 based at Plymouth.