Manuela has visited TGS a several times and has encountered her fair share of quicksand. This atheltic woman put up quite a fight against the quicksand’s suction. Even though she almost immediately sank to her knees she kept walking forward at first.
Manuela in the Little Pit of Doom
But when the quicksand reached her crotch she lost her momentum. Her efforts to drag herself forward were still impressive, but barely did her any good. Manuela sank deeper rapidly and saw no choice but to resign when the quicksand reached her chin.