 If you liked
Fushigi no Umi no Nadia
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 ...then you might like
Shinkai no Kantai: Submarine 707
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Submarine 707 especially in the beginning of the original OVA really resemblance parts of what was shown in Fushigi no Umi no Nadia.
The Atlantic vibe with the half alien like submarines that were also shown in Nadia directly got me hooked on it and gave me some really nice memories back to Nadia.
Really interesting anime series in general with a nice focus on submarines and underwater combat.
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Recommended by RafaelDeJongh