Soon afterwards Leski became the head designer for the Orzeł class submarines: the future ORP Orzeł and ORP Sęp, as well as the deputy to the lead constructor Niemeier.
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Kazimierz Leski, nom de guerre Bradl (21 June 1912 — 27 May 2000), was a Polish engineer, co-designer of the Polish submarines ORP Sęp and ORP Orzeł, a fighter pilot, and an officer in World War II Home Army's intelligence and counter-intelligence.
The plan was created for the five Polish submarines Orzeł (Eagle), Wilk (Wolf), Sęp (Vulture), Żbik (Wild Cat) and Ryś (Lynx) to use, in the event superior enemy surface forces took control of the Baltic Sea (the Polish surface navy consisted only of four destroyers and some minelayers).
ORP Sęp | ORP Orzeł | ORP | ORP Kontradmirał Xawery Czernicki | ORP ''Wicher'' | ORP ''Kontradmirał Xawery Czernicki'' | ORP Komendant Piłsudski | ORP Gryf | ORP Burza | ''Orzeł'' | ORP Wilk | ORP Wilia | ORP ''Piorun'' | ORP ''Krakowiak'' | ORP ''Dzik'' | ORP Dzik | ORP ''Burza'' | ORP Błyskawica |