The mariner uses a 250 watt free-spinning motor mounted in the front wheel for propulsion and high capacity 36 volt 9 amp hour advanced lithium battery (LiFEPO4) which provide a smooth, powered ride on flat and hilly terrain.
During Wednesday, the pace of the rescues increased from one per hour to three, progress that was measured by the spinning of the metal wheel that let out and then shortened the cable attached to the capsule -- a makeshift elevator with only two stops.