Reduce oxygen levels.

Calvo tapped at the Comcon's control screen. It was a fairly standard interface, designed for ease and clarity of use and it was simple enough to achieve the two steps he needed.

First, 'harden' the **** dome, so that the guardswomen could not simply walk out.

Second, have the system begin to purge oxygen from the interior.

It took only a few minutes for the effects to be felt. The first to notice had been swimming, and had just jogged up on to the sand. The lovely black girl could not get her breath back...gasping, she staggered a step or two, before collapsing. The guardswoman was slim, with high grapefruit sized breasts and a beautifully toned body, her skin like dark chocolate, face aristocratic and haughty. Now her lovely features were twisted with the effort of her gasping.

The others began to gather around her, and almost immediately felt the effects. Their screams and shouts were silenced by the **** dome, as they began to fall to the sand. Calvo watched the redheaded Guard captain crawl all the way to the **** barrier, and press herself against it, her breasts flattened as if it were glass, pounding at the unyielding surface, desperation twisting her pretty freckled face, before she yielded to the lack of oxygen, sliding down the barrier to lie in a heap at its base.