Refreshing themselves with water whenever they could find any in.

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Later they were thrown forward against their straps. The soft thudding of the cutter blades had risen to an ear-piercing shriek which died into silence as Harrison switched them off. "Either we've reached the subsurface " he said dryly "or this beastie has a very hard heart. They withdrew a short distance then flattened their angle of descent so that they could continue tunneling with their tracks rolling over the rocky subsurface and the cutters chewing through material which now had the appearance of heavily compressed and thickly veined cork. When they had gone a few hundred yards Conway signaled the Lieutenant to stop. "This doesn't look like the stuff that brains are made of " Conway said "but I suppose we should take a closer look. " They were able to collect a few specimens and to look closely but not for long. By.
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