Taxied past said 737 twice on Tuesday morning. Had a great view of situation as follows.
- Nose gear and right main gear still on concrete of taxi-way P not far past the corner off E towards Rwy27,
- Left main on bitumen shoulder and bogged up to rims in a +2m trench of increasing depth, and
- Evidently pax deplaned through a set of stairs at right-front
- much activity re a solution.
Both of us in our flight deck were mortified for the pilots involved... no-one does this on purpose!