The U.S. Department of Defense, in partnership with Zeno Power, is transforming decades-old strontium-90 radioactive waste into a source of power for underwater sensors and autonomous submarines. This venture, funded by the DoD's Operational Energy Innovation office and the Office of Naval Research, is part of the DEPTHS (Distributed Energy Provided Throughout the Seas) program. The aim is to create self-sustaining nodes on the ocean floor that can power underwater equipment for nearly three decades without cable connection or resupply runs. This recycling effort began with material from a radioisotope thermoelectric generator, BUP-500, which was stored at Oak Ridge National Laboratory but never deployed. The partnership has expedited the clean-up of the storage facility while also reducing disposal costs and liability at Oak Ridge. Zeno Power's Co-Founder and CEO, Tyler Bernstein, stated that this collaboration allows them to convert legacy radioactive material into clean energy for national security and scientific missions. Key players in this project include Blue Origin, Sunpower, PowerLight Technologies, the University of Dayton Research Institute, and retired Chief of Naval Operations Admiral John M. Richardson. This revival of strontium-90 nuclear power technology is not only intended for seabed applications but also for future lunar missions, with Zeno already securing a $15 million Nasa Tipping Point award to develop a similar system for the lunar surface.