The SOVUNION military industrial complex had flashes of brilliance. On the low end, the RPG and the AK-47. On the high end, the supercavitating torpedo, that plane Clint Eastwood tried to steal and of course, the Ekranoplan. A "wing in ground effect" craft, designed to skim over the water, at speed, and fly like a conventional craft.
Here it is, rotting on the dock in Kaspiysk:
Reminds me I need to go back and read Stross' novella, which his publisher is giving away for free.