An evil woman named Madam Q has kidnapped a female group of swimmers (!) to conduct a series of hideous human experiments. You, as a member of a secret service team, must stop her evil plans and rescue them as soon as possible.
The game offers two types of gameplay (underwater zone and base zone) throughout each stage. In underwater zone you dive and swim through the level, looking for an exit in order to proceed to the base zone. You're armed with a standard speargun to eliminate enemies. You may find other weapons (of limited ammo though) either found on the ground or from specific enemies being killed. At the base zone, you walk and jump across platforms shooting everything that moves until reach the end of the stage. Nasties vary from divers, robots etc. Note that at the end of some levels you face a stage boss too. All in all it's a nice game to play with lots of action.
The ZX has nice colorful graphics, although the background scrolling is flickering during gameplay. The sprites are nicely designed and animated too, a bit small though. Overall, the graphics are well presented on the ZX version, but the C64 version runs smoother and faster with bigger playable area, whilst the CPC version is more colorful.
The sound uses typical shooting sound effects, explosions etc whilst there is no in-game music.