Autonomous mine inspection rover built without touching physical hardware. Full digital twin first approach using NVIDIA Isaac Sim. 1. PPO-trained locomotion in PyBullet with 200K training timesteps 2. ROS 2 sensor nodes for IMU, LiDAR, and BLDC encoders 3. Full 3D visual simulation in NVIDIA Isaac Sim 5.1 with live sensor feeds. 160m tunnel traversal at 3.00 m/s, 95% complete, fully autonomously 4. SLAM via slam_toolbox and RTAB-Map for real-time underground mapping 5. Crack detection, gas sensing, and spark-proof chassis design Next milestone: Bridging Isaac Sim to ROS 2 for live RViz 2D SLAM map generation during exploration