The best replacement for submarines is surface ships.

The best alternatives to submarines are rated as following:
★★★★★  surface ships
★★★★  destroyers
★★★  planes
★★★  diesel submarines
★★  aircraft carriers
★★  russian submarines
★★  aircraft carrier
★★  us submarines
★  u boats
★  u-boats
★  astute
★  chinese submarines

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Google Trends

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submarines
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