Captain Sonar: Upgrade One

The silent war that rages beneath the waves intensifies and takes a radical and... strange... turn.

The engineers at Archer Inc., the most powerful weapons conglomerate in the world, have discovered new, innovative materials and heretofore unknown energy sources in the deepest and most secret of oceans.

Thanks to tremendous research and development progress in recent months, the submarines now carry unstable weapon prototypes.

On the fringe of this abyssal war, exploration vessels take advantage of these emerging technologies to dive ever deeper and find new navigational routes.

This is expansion for Captain Sonar, and the base version of the game is required to play.