What was the main outcome for both submarines used in the Civil War?

The outcome of both submarines used during the Civil War is that they were indeed destroyed. The most notable submarines from that era were the Confederate submarine H.L. Hunley and the Union's attempted underwater vessels, such as the USS Alligator. The Hunley, after successfully sinking the USS Housatonic, was lost shortly afterward during its return trip, and the USS Alligator, despite its initial designs and intent for operation, faced numerous issues and was not successfully employed in combat scenarios, ultimately being lost at sea.

Thus, the main outcome reflects the challenges faced in submarine technology at the time, leading to their destruction rather than operational success or military victories.