If you stood in a pool of wet cement up to your shoulders, would you be crushed as the cement dried or would it be molded around you?
well neither actually, but it would be unpleasant and you'd probably still die, being buried to your shoulders in wet sand would have the same effect... each time you exhaled and your chest depressed the cement would take up the space, as it slowly dried the space you were in would become smaller and smaller and by the time it dried the space you were in would be so tight you wouldn't have room for your chest to expand when inhaling and you would suffocate. I guess you could survive if you kept your hands in front of you to keep room open for your chest expansions.
