Ekranoplanes function better the larger they get. The Caspian Sea Monster was not the endpoint of ekranoplane engineering. It deals well with ~1m wave height.

Ekranoplanes function better the larger they get. The Caspian Sea Monster was not the endpoint of ekranoplane engineering. It deals well with ~1m wave height. For the Black Sea / Mediterranean sea or the Baltic, a larger version would be required, and for the Atlantic or Pacific, larger still. You could plausibly even fly it over Arctic sea ice fields without bergs. Boeing was throwing around proposals for a ground effect aircraft several times this large in the early 2000's, with the largest bumping up against the weight range of naval destroyers at ~5000 tonnes. https://en.wikipedia.org/wiki/Boeing_Pelican https://en.wikipedia.org/wiki/Boeing_Pelican