Swerve drive?
Some how I have a strong feeling that this is a version of swerve drive. Think about it, why would they want to use three drills just to turn the wheels? The three drills are used to turn the wheels with the help of beval gears, so there could be something else that rotate the wheel box. So, all 4 wheels will spin the same speed, while some other motor steer the robot.
After all, this is just a sneak peak. The robot is probably more than just this.
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