Anti Grav drive was shut down while the combat units were making their way into the fight from the vehicle.
The vehicle falls away nose first from the dock of the facility towards the liquefied earth below.
Most of the units inside fell against the cockpit partition, stack ontop of each other.
3 lucky/unlucky units were halfway out when it started to fail, the first falling head first, the 2nd losing grip and plunging helpless.
The third has a firm grip, but is going down with the vehicle.
The pilot closed the rear door to keep the liquid earth out, but its no use, the vehicle will sink deeper and deeper into the abyss.