HMS L21 was a British L class submarine built by Vickers, Barrow-in-Furness. She was laid down on 15 September 1917 and was commissioned on an unknown date. L21 was sold in February 1939 but became stranded on the way to the breakers.
| Identifier (URI) | Rank |
|---|---|
| dbkwik:resource/moTblDbWok_3l_VuNC8sjw== | 5.88129e-14 |
| dbr:HMS_L21 | 5.88129e-14 |
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