The HD™ TMS has been designed around a field-proven 'shuttling drum' concept that provides exceptionally simple tether routing. The complete tether drum moves on a carriage system allowing the tether to exit the drum directly above and through the payout sheave.

Power supply to the TMS requires only a single branch circuit from the surface. This contributes to a smaller umbilical cross section and a more compact surface power distribution unit, without sacrificing performance. ​