Published at the MTS Underwater Intervention 2017 and 2018 conferences, this work presents the results of a 5 year study to investigate the use of a honeycomb structure in deep sea submersible window seats as a means to maintain stiffness and decrease weight. As viewing area increases, the window seat required to support a traditional submersible window becomes quite large and a significant weight penalty is incurred due to the discrepancies in yield strength and stiffness between acrylic submersible windows and typical submersible hull materials. This study examined the effect of supporting the window using a honeycomb structure with window bearing surface 'defects' (honeycomb holes) far in excess of those allowable by the ASME-PVHO-1 standard. The study showed that it is feasible to support a window with a honeycomb window seat geometry without jeopardizing the integrity of the acrylic window itself. The study was conducted as a joint venture between OutsideInnovation and the Roatan Institute of Deepsea Exploration.