JUMP INTO THAT HOLE!!!
After the drill breaks through, I like to hang around and keep shooting grievers just so I can hear Sgt Duke get frustrated because we won't jump in. In this game, I stayed on the surface for 5 mins just blasting then Duke yelled at Samus--"JUMP-INTO-THAT-HOLE!" I would have sworn I heard him add a "...goddamnit!!!" at the end! LOLOL
I'm going to play it again and this time I'm not going to jump in at all--just to see how the game reacts!!