1. Put a turret on the wobbly platform and have someone get on the turret.
2. Use grav lifts from the "scenery" option and put them on the wobbly platform. The platform will begin to go up and down.
3. Using another grav lift underneath the platform, manually maneuver the platform so it becomes dislodged until you get it facing upside down on the floor.
4. Have the player(s) on the turret(s) press "UP" on the D-pad to turn into the "guilty spark" bot and you'll be under the floor.