Bucky

Bucky leaped first and managed to get a grip on the plane's wing. Captain America missed, and shouted to his partner to let go in case the plane was booby-trapped. Bucky was unable to comply with his partner's commands because his uniform sleeved snagged onto the cockpit of the plane. The plane exploded, seemingly killing Bucky instantly. Captain America plunged into the English Channel to undergo the process of suspended animation, but Bucky's remains were never recovered strengthening the belief that he was killed in action.

Bucky however was very much alive. When he had failed to disarm the plane in time he had leaped off of the plane but did not escape completely unscratched. The explosion had claimed his entire left arm. He then plunged into the icy waters only to undergo the same process his mentor had. After the war had ended, a Russian submarine hoping to recover and capture the missing "Captain America" instead found the preserved body of Bucky. After being retrieved and examined for any traces of the Super-Soldier Serum, his body was placed in cryostasis.

Captain America (Steve Rogers) discovered the true identity of the Lukin's assassin and confronted him at the vault. The two engaged in combat until Rogers gained possession of the Cube and used its powers to restore James' lost memories. Overcome with remorse, Barnes used the cube to teleport away and went underground to search for Lukin and the Red Skull, still unaware that they were now one and the same