[2] For surface running, the boats were powered by two 950-brake-horsepower (708 kW) diesel engines, each driving one propeller shaft.

[3] On the surface, the third-batch boats had a range of 6,000 nautical miles (11,000 km; 6,900 mi) at 10 knots (19 km/h; 12 mph) and 120 nmi (220 km; 140 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged.

[4] It is uncertain if Sirdar was completed with a 20-millimetre (0.8 in) Oerlikon light AA gun or had one added later.

[5] In 1943 Sirdar made an involuntary dive to a depth of over 380 feet when she became out of control on an exercise with Tony Spender in command.

She hit the muddy bottom and became stuck for a while until finally surfacing attempts were successful.

[6] Sirdar spent most of the war in the Pacific Far East, where she sank two Japanese coasters, two sailing vessels, two unidentified vessels, and the Japanese guard boat Kaiyo Maru No.5.