Captures the role played by the Royal Navy in the defence of Britain, and their role in convoy escort.
| Release Date | December 1, 1940 | |
|---|---|---|
| Status | Released | |
| Original Title | Mastery of the Sea | |
| Runtime | 19min | |
| Budget | — | |
| Revenue | — | |
| Language | English | |
| Original Language | English | |
| Production Countries | United Kingdom | |
| Production Companies | Ealing Studios | |