To protect sensitive electronic equipment from damage incurred by shock forces in near miss-hit situations, Enidine designed and developed the patented Shock Isolator Double Acting Spring (SIDAS). The SIDAS design combines a preloaded mechanical spring to provide static preload forces with a low-pressure hydraulic damper to provide dynamic damping forces. During normal shipboard operating conditions, the hydraulic damper of the SIDAS remains at atmospheric pressure while the preloaded mechanical spring provides static preload forces. During a shock event, the SIDAS experiences a pressurized condition (1500 psi) for a duration of less than 1 second. This low-pressure situation ensures positive fluid sealing, thus providing long-life shock attenuation over the range of all four-deck frequencies.