This document describes an underground parking system that allows three cars to park in a single space. It uses a multi-level compartment structure driven by a DC motor to stack cars vertically. Infrared sensors detect vehicles in each compartment and an LCD display interface shows available slots. Users enter a 3-digit code when parking and vacating to identify their vehicle. The system occupies less space than surface parking by stacking vehicles underground across three levels accessed by the motorized mechanism.