So far, more than 300 passengers have been rescued from the stricken ship overnight via helicopters. The process is slow as only one helicopter at a time can airlift passengers from the ship. Police said 16 people have been taken to hospital after being airlifted from the Viking Sky, three of them with serious injuries. Air evacuations have now ceased while the ship is towed back to shore. https://twitter.com/alexus309/status/1109537029912711168 Most of those on board are said to be British or US citizens. It's thought that five helicopters and a number of rescue ships were drafted in to provide support. However, one of the rescue ships also lost engine power and the "brutal" conditions meant lifeboats were forced to turn back. Video posted on social media show furniture sliding around inside the ship and debris falling from the ceiling as it is hit by waves on the notorious stretch of water, known as Hustadvika.