"It's good to know there's no dangerous life forms down there. This place is as safe as the surface of the Moon."
"I don't know, Bob," said Master Scientist Ludwig as they hovered momentarily a dozen feet above the surface. "I have the darndest feeling about Mars."
Seconds later a gigantic maw opened in the surface of the Red Planet beneath the Lander--and the two-man crew vanished without a trace. (87 words.)