＇＇199＇＇ 〃I don't know。 They might be。〃
〃Let's get going；〃 Norman said。
He tasted the dry metallic pressed air inside his helmet and felt the numbing cold of the water as he slid through the floor hatch and fell in darkness to the soft muddy bottom。 Moments later； Beth landed just behind him。
〃Okay？〃 she said。
〃Fine。〃
〃I don't see any jellyfish；〃 she said。
〃No。 Neither do I。〃
They moved out from beneath the habitat； turned； and looked back。 The habitat lights shone harshly into their eyes； obscuring the outlines of the cylinders rising above。 They could clearly hear the rhythmic thumping； but they still could not locate the source of the sound。 They walked beneath the stanchions to the far side of the habitat； squinting into the lights。
〃There；〃 Beth said。
Ten feet above them； a blue…suited figure was wedged in a light stand bracket。 The body moved loosely in the current； the bright…yellow helmet banging intermittently against the wall of the habitat。
〃Can you see who it is？〃 Beth said。
〃No。〃 The lights were shining directly in his face。 Norman climbed up one of the heavy supporting stanchions that anchored the habitat to the bottom。 The metal surface was covered with a slippery brown algae。 His boots kept sliding off the pipes until finally he saw that there were built…in indented footholds。 Then he climbed easily。
Now the feet of the body were swinging just above his head。 Norman climbed another step； and one of the boots caught in the loop of the air hose that ran from his tank pack to his helmet。 He reached behind his helmet； trying to free himself from the body。 The body shivered； and for an awful moment he thought it was still alive。 Then the boot came free in his hand； and a na