RMS Titanic sank on 15 April 1912 in the North Atlantic Ocean. The largest ocean liner in service at the time, Titanic was four days into her maiden voyage from Southampton, England, to New York City, with an estimated 2,224 people on board when she struck an iceberg at 23:40 (ship's time) on 14 April. She sank two hours and forty minutes later at 02:20 ship's time (05:18 GMT) on 15 April, resulting in the deaths of more than 1,500 people, making it one of the deadliest peacetime maritime disasters in history. Titanic received six warnings of sea ice on 14 April but was travelling at a speed of roughly 22 knots (41 km/h) when her lookouts sighted the iceberg. Unable to turn quickly enough, the ship suffered a glancing blow that buckled the steel plates covering her starboard side and opened six of her sixteen compartments to the sea.