Long Patrol: Making Mare Nostrum a Hollow Jest - RN Submarines in the Meditteranean

Published displacement figures and contemporary naval reference books require source criticism because navies controlled much of the information they released.

The pre-war Royal Navy treated submarines as ambush weapons, scouts, and minelayers rather than its primary commerce-raiding arm.

Cruiser blockades aimed to seize useful merchant hulls, while captured and allied fleets expanded Britain's wartime carrying capacity.

Limits on total submarine tonnage encouraged the Royal Navy to balance large ocean boats against more numerous smaller boats for confined waters.

Large boats of the O, P, and Rainbow classes were designed for Pacific-range patrols rather than the confined and dangerous Mediterranean.

Royal Navy boats made long passages and much of their tactical movement on the surface before submerging to ambush.

Standardizing 4.5-inch weapons across destroyers and submarines could have simplified ammunition supply across ship types.

The smaller S class traded oceanic reach for a better fit with the Mediterranean and North Sea patrol environment.

Diesel-electric boats could not convert their quoted low-speed underwater range into a long high-speed chase or escape.

Glowing marine organisms sometimes made a submarine's movement visible from the air in Mediterranean waters.

The Grampus class turned a large submarine hull into a long-range minelayer able to place up to fifty mines.

The Grampus-class minelayer HMS Seal entered German hands after mine damage, making her survival a case of capture rather than continued Royal Navy service.

Planning against Japan justified Pacific-capable submarines while avoiding the politically implausible case of openly budgeting for war with the United States.

T-class arrangements favored a large opening attack, then gave later wartime boats rearward tubes for breaking contact.

After a supply-ship attack near Crete, two Thrasher crewmen removed unexploded bombs from the submarine's casing in extreme danger.

Small U-class submarines achieved substantial results in the Mediterranean, including boats operated by Polish crews.

HMS United's Mediterranean record connects U-class patrol warfare with the Allied invasion of Sicily and an unusual attack on a surfaced transport submarine.

Gibraltar, Malta, Alexandria, and the sea's constricted routes shaped where Royal Navy submarines could patrol and strike.

Many British convoys accepted a roughly five-week voyage around Africa rather than force the contested Mediterranean passage.

Shipping losses in the Mediterranean mattered because they destroyed both cargoes and the scarce hulls needed to resupply North Africa.

Gibraltar was both a submarine base and a guarded gateway intended to confine Italian naval power to the Mediterranean.

Small submarines operating from Malta attacked a large volume of Axis shipping and warships on the central Mediterranean routes.

HMS Urge carried two Special Boat Service men ashore to sabotage a Sicilian railway line supplying the Axis war effort.

Mediterranean submarines disrupted enemy movement while also scouting, inserting raiders, and compelling coastal security measures.

The Mediterranean drew large Royal Navy submarines away from the Far Eastern deterrent role for which many had been positioned.

Simple maps of Mediterranean control mislead because neither Axis nor Allies could operate there without persistent opposition.

A small 10th Flotilla imposed a strategic cost on Axis supply traffic that helped shape the North African campaign.