But just five days later, the Transocean Winner rig grounded on Dalmore Beach on the Isle of Lewis. The tow line had snapped, and the rig drifted towards the coast as “severe gale force” winds hampered the voyage. By 6.52am, the Transocean Winner was grounded at Dalmore Beach near Carloway on the Isle of Lewis. The report concluded: “The voyage planning concentrated on significant wave heights and did not consider the effect of high winds on Transocean Winner. “In his attempts to maintain control of the tow the master placed sufficient strain on the tow line to cause damage.