The Kriegsmarine after a failed Operation Sea Lion

What would the Kriegsmarine do after being forced into a disastrous Operation Sea Lion?

It would likely cease to exist as a meaningful surface fleet, leaving only fragments and little political appetite for reconstruction.

Only scattered submarines and fast attack craft might survive a channel death ride. The German surface fleet would cease to exist as an operational instrument rather than merely suffer a temporary setback. Rebuilding would demand ships, yards, crews, and political attention at the same time the regime needed resources elsewhere. The navy would probably wither, with its surviving manpower eventually absorbed into the wider land war.