HMS H21
From Warlike
Q4299614
HMS H21 was a British H-class submarine built by Vickers Limited, Barrow-in-Furness, as the first of the Batch 3 subgroup. She was launched on 20 October 1917 and was commissioned on 28 January 1918. H21 was an improved design of the H class which produced a larger displacement and the latest 21-inch torpedo tubes replacing the old 18-inch torpedo tubes. This would be incorporated into all batch 3 H-class submarines. HMS H21 was sold to John Cashmore Ltd on 13 July 1926 for scrapping at Newport.
Wikidata
Vickers Limited, Royal Navy, United Kingdom of Great Britain and Ireland, 
Location: KML, Cluster Map, Maps,
1917-10-20T00:00:00Z
1917-10-20T00:00:00Z
ship launching
1918-01-28T00:00:00Z
1918-01-28T00:00:00Z
ship commissioning
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