Seriously!  See it??

While Carina schools Gabe in Karst Processes… have fun with that one- looks involved…

…Mark has already begun the climb (or should I say walk) out of the sinkhole… And for now the airplane, with the reappearing and disappearing skeleton (remember The Cave of the Dead??) is causing nary a ripple in the plot.  Wait ’til that engine fires up and the plane takes off with that grinning thing (skeletons have no choice but to grin…) having fun at everyone’s expense…