In that case, I wonder if the flooring near the hatch might be a little weak? (I mean, structurally it's inherently compromised by dint of putting a hole there, anyway.) Then you can have investigation raise concern about the flooring, or perception hear some creaking as someone STR-checks their way to opening the hatch, maybe a DEX save to avoid taking the fall if the floor crumbles? Then you've also got a spiked ladder to get down. It's easy to avoid if the character takes their
time, but maybe a buddy is lying down there making death saves and you're worried about the time?