the cantilever deck of the Usumacinta to strike the top of the production valve tree on the rmKab-101 platfo, resulting in a leak of oil and gas. At 1420 hours, the subsurface safety valves of wells 101 and 121 were closed by PEMEX personnel, but the valves were unable to seal completely allowing the continued leaking of oil and gas. At around 1535 hours on 23 October, the 81 personnel on the Usumacinta were evacuated by lifeboat, with the ship Morrison Tide providing fire support. Rough seas hampered the rescue operation and appear to have caused the break-up of at least one liferaft.