A tiny boat floats vulnerably on the crest of a wave and a stormy sea. In the sky, a large squadron of planes gathers, above which hovers a fleet of helicopters. The planes peel off and it's soon clear they are flown by Kamikaze pilots.
The boat moves left and right. As it does so, it slithers sickeningly down one side of a wave and then up the other, adding to the difficulty of potting the enemy with your on-board rocket launcher.
Planes missing you crash into the sea, but if one hits you, the result is startling - your boat is blown clean out of the water before sinking, with a gurgling sound, to the sea bed. Lose all your boats and the band strikes up with "Good Evening, Friends"!
The helicopters fly down to hover nearby, letting rip with their machine guns which fire diagonally. Wipe out a fleet of planes and choppers and the band plays a suitable shanty to signify your promotion from galley slave to boatswain.
The challenge increases with each round. Later screens include floating mines, planes which enjoy blanket bombing, and Exocet missiles which scream toward you from either side. The ocean gets decidedly rougher too. There are ten rounds, each of which can be played at any of four levels of intensity. If you're good enough, you might end up as an Admiral or Defence Chief.