sentences:  As the planet warms, the complex phase transitions of water and ammonia mixtures at these low temperatures mean that a frozen lake can melt in seconds, carry the ship off in a flood, and equally suddenly leave it hung up on large rocks, unable to move as the liquid around it freezes again, trapping some of the crew below the surface in their protective suits.A few of the "Kwembly"'s crew are dispatched to report on the condition of the surroundings, but come across one of the crew from the "Esket", who is doing likewise in one of the dirigibles that Barlennan is clandestinely using to move his men and matériel around.He momentarily appears on a screen and is recognized by Easy.