Submarines - military combat; Submersibles - scientific exploration.

Submarines - larger, high capacity; Submersibles - smaller, limited capacity.

Submarines - great depths; Submersibles - shallower depths.

Submarines - powerful engines, high speed; Submersibles - limited speed and range.

Submarines - large crew, long-duration missions; Submersibles - smaller crew, shorter missions.

Submarines - armed and defended; Submersibles - not armed or heavily defended.

Submarines - stealth features; Submersibles - bright colors, lights for visibility.

Submarines - expensive, government-owned; Submersibles - varied sizes, commercially available.

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