In 2015, Canada’s international marine trade with countries outside North America reached a substantial $205B, comprising 80% of the total trade. The repair sector within the marine industry is vital, representing about 72% of the expenses associated with maintaining marine vessels. In addition, Canada will spend $111B over the next 30 years to manufacture ~25 new ships for the Canadian Coast Guards and the Navy, where more than $75B of this investment will be on repair, maintenance, and overhaul. In the maritime sector, repairing damaged equipment can be expensive and challenging because transporting such equipment to dry docks is often impractical and costly. Acquiring replacement parts can also be expensive and requires significant storage space. In this project an innovative solution to these growing opportunities is presented involving the implementation of a underwater metal additive manufacturing (AM) machine using the direct metal deposition (DMD) concept and machine learning platforms for repair and spare part support. This innovative approach has the potential to significantly reduce the dependence on off-route docking for resupply needs, leading to improved response times and accessibility. By having a DMD machine onboard, vessels can efficiently address maintenance requirements, enhance operational efficiency, and minimize downtime. Nonetheless, underwater 3D printing presents various challenges compared to onshore sites such as limitation with large parts, dealing with harsh environments, and controlling stability. Successfully implementing underwater additive manufacturing allows for the convenient repair of crucial metallic parts such as propellers and offers continuous monitoring without the limitations imposed by human intervention.