Regulars of the Udvar Hazy annex will know about the restored Japanese fighter designed to launch from a submarine. Turns out they've found the mother ship. Again. Seems we sank it 60 years ago. More's the pity. Still, it's a little strange to see something 20 or 30 guys spent 5 years restoring in a museum I regularly take my daughter to see, and then see the thing designed to launch it on the bottom of the ocean, buried with the crew who sailed it.