Alexandria and Malin soon would find out, that the more the 'sack' they was in contracted, they had enough purchase to their legs - if they did not kept it closed and pulled under themselves - to keep their heads abowe... and getting closer to the only entrance-exit they knew about. Of course, it was closed tight, like a clenched fist, so they found themselves - their heads - pushed against it, with the only dress still kept abowe the ... slime. Then something gurgled, the pressure grew, and with a final release of the air from abowe them through the tightly closed hole, they was fully surrounded by the liquid. Every fast movement still made it hard as earth, only slow, like breathing keeping it slippery and liquid like.
As Senevie realises, Melanie should have long disappeared into the corridor, almost a minute now, and was on the other side of the closed off tube...
Amreil and Eras soon fight their way to the 'girls', and Patience bit as much as she could chew, so they somehow found themselves with Senevie on the other side of the air duct, the corridor free to crawl through to where the Y had once started the branching of the corridor to left and right, and its downward incline. So, basically they now have a straight level way back to the door, but both left and right way are closed off. The left one more fully, the right, where they came back from, more damaged, but still not trawellable by four fully grown person with all the equipment they had with them... Maybe not even without them.