1) In step one, strings of webbing are shot out from a mass of webfluid, neurons, and other cells usually undifferentiated, but able to rapidly form complex tissues. The strings stick to the cave walls.
2) In step two, these strings are retracted, pulling the mass forward and detaching it from the main body of the animal. A single string connects to the animal, communicating both ways.
A very large cavern can be quickly mapped this way and any webmaster attached to the network can immediately know the location of every vertex. In this way, the webmaster aliens are able to navigate (and communicate). Eventually, the cells inside the hardening webfluid shut down from lack of nurishment after several hours and must be reabsorbed by a webmaster, only to be shot out again as little as fifteen seconds later.
These creatures hatch from eggs less than half a millimeter long and grow up to be as large as a school bus. They are completely blind and deaf, and hunt by smell and web-touch. The webs are not sticky and they must run down prey, crushing it in their claws (or use tools held in the claws). Their diets are ninety percent bacterial growths, but they do sometimes eat animals. The webmaster shown below has attached webmasses on both ends, but of different shapes. The mouth is on the underside of the segment with the claws.