This project centers on ocean protection through an eco-friendly hotel design set in 2030. Each room features a large water-interaction device that integrates all interior design elements and interacts with the entire hotel. The device's optimal structure is achieved via algorithms that maximize structural performance while minimizing material use. The physical model is divided into 120 parts, 3D-printed in PETG using a Bambu printer, and assembled with a 3D pen for welding; the interior is filled with biochar-concrete. The goal is to land a 100% CO2-free model with a full-scale prototype.