Section - The draught
The draught is obvious scenery in the crypt. "There seems to be a breeze coming from [a crack]." Understand "breath/whiff/wind/breeze/guff/gust" as draught.
Instead of listening when the player is in the crypt: say "It's all very quiet down here. You'd think you'd be able to hear some dripping water or even some of the jungle sounds from outside, but no. The only thing you can make out is the faint sound of a draught of wind."