The first sign of trouble aboard "Estonia" was when a metallic bang was heard, presumably caused by a heavy wave hitting the bow doors around 01:00, when the ship was on the outskirts of the Turku archipelago, but an inspection—limited to checking the indicator lights for the ramp and visor—showed no problems. Over the next 10 minutes, similar noises were reported by passengers and other crew. At about 01:15, the visor is believed to have separated and torn open the behind loading ramp. The ship immediately took on a heavy starboard list (initially around 15 degrees, but by 01:30, the ship had rolled 60 degrees and by 01:50 the list was 90 degrees) as water flooded into the vehicle deck. "Estonia" was turned to port and slowed before her four engines cut out completely.