Cold War nuclear accidents left weapons scattered across ocean floors, and this episode of the Drain the Oceans series uses CGI to pull the water away and show where they ended up. The film reconstructs incidents like lost hydrogen bombs and sunken submarines, using declassified records, sonar data, and interviews with military historians and engineers to piece together what happened when weapons went missing at sea. Digital recreations rebuild the seabed terrain and the wreckage sitting on it, letting viewers see the scale of debris fields that real divers can rarely access. Experts walk through the search-and-recovery operations mounted at the time, some successful, some abandoned, and explain why certain weapons were never found. The larger picture that emerges is of a nuclear arsenal in motion during decades of tension, with accidents at sea treated as closely guarded secrets rather than public news. The CGI seabed reveals are the show's signature device, and here they carry real historical weight.