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Career
Ordered:	August 26 1947
Laid down:	na
Launched:	March 5 1954
Completed:	November 28 1956
Commissioned:	na
Decommissioned:	na
Fate:	Scrapped March 5 1962
Struck:	na
General Characteristics
Displacement:	780 tons surfaced 1,000 tons submerged
Length:	178 feet (54.3 m)
Beam:	15.7 feet (4.8 m)
Draught:	11 feet (3.4 m)
Propulsion:	Submerged - High Test Peroxide (HTP) steam raising plant driving steam turbines, two shafts Surfaced - Diesel electric
Speed:	maximum 25 knots (46.3 km/h) dived
Range:	na
Complement:	49
Armament:	none

In 1946 the experimental High test peroxide (HTP) powered U-boat 1407, which had been scuttled following the German collapse, was salvaged and eventually commissioned into the Royal Navy as HMS Meteorite. Her recovery was the impetus for a British research programme which resulted in the construction of two experimental submarines, HMS/m Explorer and Excalibur. Built for speed trials, they were unarmed. Their HTP engines were essentially steam turbines, with the steam being generated by the interaction of HTP with diesel oil and a catalyst.

Explorer suffered from so many teething troubles that her first captain never took her to sea. When these initial problems were conquered, however, she turned out to be impressively fast, achieving submerged speeds of 25 knots (46.3 km/h), aided by her streamlined hull and retractable fittings.

Both Explorer and her sister ship were fitted with the latest underwater escape technology, including a one-man escape chamber, and equipped with up to date escape breathing apparatus.

Explorer and Excalibur were popularly known as the 'blonde' submarines because of their hydrogen peroxide fuel and they served a useful purpose as high-speed targets for the Royal Navy's anti-submarine forces. Their main use, however, was to finally prove that HTP was of no longterm utility as a air-independent propulsion for submarine use. The volatile HTP was carried in special bags outside the inner pressure hull, and were prone to exploding unexpectedly. Additionally, the engine room (which was unmanned while under way) would often be the scene of flames appearing on the top of the combustion chamber, and on at least one occasion the crew were forced to evacuate the pressure hull and stand on the upper casing to avoid fumes which had suddenly filled the boat. The HTP fuel proved to be so toublesome that the boats quickly became known as Exploder and Excruciator.

Although part of the 3rd Submarine Squadron, the two submarines tended to operate independently, accompanied by their own depot ship HMS Kingfisher and a fuel carrier, the converted water-carrier, Royal Fleet Auxiliary RFA Spabeck.

When the US Navy succeeded in designing a nuclear reactor suitable for submarine installation, the HTP project was abandoned, and Explorer and Excalibur were scrapped.