Loud grinding noise: won't restart

I checked the torque screws. They were all secured. I removed the spark plugs and placed a screwdriver in the sockets. All of the pistons moved except the last one, which seems to indicate a bad rod. Does anybody know a way to remove the oil pan without having to remove the engine? Eventually, Im probably going to have to remove the engine anyway, to see if any more damage was done when the rod broke.