A regenerative shock absorber that include a housing and a piston that moves at least partially through the housing when the shock is compressed or extended from a rest position. The passivation layer is formed on top of the first contact and the second contact and is configured to substantially minimize dark current in the optoelectronic transducer. The memory device is configured to implement a first lookup table. The apparatus further ensures that passengers can safely disembark from the elevator car by detecting the position of the elevator car relative to a designated landing zone within the hoistway, and confirming the elevator car is stopped at a landing zone prior to disengaging the lock. The frozen water is then removed by sublimation process and an absorbent fibrous foam recovered.