The worldâs largest pipe-laying vessel, the Pioneering Spirit, passed through Istanbulâs Bosphorus on the morning of May 2, 2018, in Turkey. The Black Sea entrance of the Bosphorus was closed to naval traffic due to the passing of the 477-meter-long vessel. On April 30, Pioneering Spirit captain Loek Fernengel said Allseas, the company that owns the Pioneering Spirit, has the worldâs most technologically advanced pipe-laying vessel, which is not only designed for pipe-laying but also for the installation and decommissioning of oil and gas platforms. Photo by Ali Aksoyer/DHA/Depo Photos/ABACAPRESS.COM