HMS Explorer (submarine)

{{short description|Submarine of the Royal Navy}}

{{other ships|HMS Explorer}}

{{Use dmy dates|date=February 2017}}

{{Use British English|date=February 2017}}

{{Infobox ship begin}} {{Infobox ship image |Ship image= Hms_explorer_submarine.jpg |Ship caption= HMS Explorer (S30) }} {{Infobox ship career |Hide header= |Ship country=United Kingdom |Ship flag=File:Naval Ensign of the United Kingdom.svg |Ship name=Explorer |Ship ordered= 26 August 1947 |Ship awarded= |Ship builder= |Ship original cost= |Ship yard number= |Ship way number= |Ship laid down= |Ship launched= 5 March 1954 |Ship sponsor= |Ship christened= 28 November 1956 |Ship completed= |Ship acquired= |Ship commissioned= |Ship recommissioned= |Ship decommissioned= |Ship in service= |Ship out of service= |Ship renamed= |Ship reclassified= |Ship refit= |Ship struck= |Ship reinstated= |Ship homeport= |Ship identification=Pennant number: S30 |Ship motto= |Ship nickname=Exploder |Ship honours= |Ship fate=Scrapped, February 1965 |Ship notes= |Ship badge= }} {{Infobox ship characteristics |Hide header= |Header caption= |Ship class={{sclass|Explorer|submarine}} |Ship displacement=*{{convert|780|LT|t|lk=on}} (surfaced) {{convert|1000|LT|t}} (submerged) |Ship length={{convert|178|ft|m|abbr=on}} |Ship beam={{convert|15|ft|8|in|m|abbr=on}} |Ship height= |Ship draught={{convert|11|ft|m|abbr=on}} |Ship depth= |Ship power= |Ship propulsion=*High Test Peroxide (HTP) steam raising plant driving steam turbines (submerged) Diesel-electric (surfaced) 2 shafts |Ship speed={{convert|25|kn|lk=in}} (submerged) |Ship range= |Ship endurance= |Ship test depth= |Ship complement=41 |Ship armament=None }}

HMS Explorer was an {{sclass|Explorer|submarine}}, an experimental British submarine based on the captured German high test peroxide (HTP) powered U-boat U-1407. U-1407 had been scuttled following the German collapse at the end of the Second World War, 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 Explorer and {{HMS|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 a peak speed of over 30 knots,{{Cite web |last=Brown |first=George |date=28 May 2024 |title=HMS EXPLORER - A Personal experience by George Brian Brown |url=http://www.hmsresolution.org.uk/forends/SUSPENEDED%20PAGES}} a speed record at the time for a submarine, and average 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 oxidiser 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 impractical as an air-independent propulsion system for submarine use. The HTP was carried in special bags outside the inner pressure hull, which were prone to exploding unexpectedly. Additionally, the engine room (which was not occupied 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 troublesome that the boats quickly became known as Exploder and Excruciator.Preston, p. 527

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.

There were so many practical problems with the technology, one Royal Navy submariner remarked that, 'I think the best thing we can do with peroxide is to try to get it adopted by potential enemies'.{{Cite web |title=1955 - 1970: Explorer Class |url=http://rnsubs.co.uk/boats/subs/explorer-class.html |access-date=2024-05-28 |website=rnsubs.co.uk}}

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.