Russians tested a 4.8 Kiloton T-5 nuclear torpedo in 1957. They used three decommissioned submarines as targets. The weapon was detonated at 20 meters below surface and sank two of the three submarines at a distance of 6.5 miles. As previously mentioned nuclear torpedoes of the era relied on blast damage rather than precision. The shock wave could easily break the hull of any vessel, be it underwater or on the surface.