Shiro Sagisu scored Nadia: The Secret of Blue Water before he became the Evangelion guy and you can already hear why Hideaki Anno kept calling him back. That opening theme "Blue Water" with Miho Morikawa's vocals is burned into the brains of everyone who watched this in the early 90s.
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"Battle at Sea" has this grand orchestral punch that makes the Nautilus sequences feel massive. Then "Loneliness and Tranquility" pulls everything back to something intimate and aching. "Grandis' Pursuit" is pure comedic energy, totally different register.
The whole score swings between adventure and genuine emotional depth without ever feeling disconnected. If you want to hear where the Anno/Sagisu partnership started before it defined mecha anime forever, this is it.