British maritime authorities launched an investigation into a near-miss accident involving a Royal Navy’s nuclear-powered submarine and a cruiseferry crossing between mainland Britain and Northern Ireland.
A 150-min crossing between Belfast (Ireland) and Cairnryan (Scotland) could have turned deadly for travelers onboard Stena Superfast 7 ferry, which encountered a Royal Navy nuclear sub in November 2018 (the incident is just now made public). The unidentified submarine was submerged at the time, with its periscope visible above the water.
Stena Line confirmed that on November 6, 2018, "Stena Superfast VII and a submerged submarine came into close proximity during a scheduled crossing.” Despite the near miss accident, the transport operator added that “at no stage were the vessel, passengers or crew in any danger.”