Why did the Titanic sink?

On its maiden voyage from Southampton to New York, the RMS Titanic struck an iceberg in the North Atlantic at about 11:40 p.m. on 14 April 1912. The impact did not tear a single long gash; instead it buckled steel plates and sprang rivets along the starboard bow, opening narrow gaps to the sea. Water flooded the forward compartments faster than the pumps could cope. As the bow settled, the sea spilled over the tops of the internal bulkheads into compartment after compartment. Around 2:20 a.m. on 15 April, the ship broke in two and sank roughly 12,500 feet to the seabed. Of about 2,224 people aboard, more than 1,500 died in the freezing water.

A ship floats because of reserve buoyancy, the sealed volume above the waterline. The Titanic was divided into sixteen watertight compartments and could stay afloat with up to four of them flooded, a genuinely advanced design for 1912. The fatal flaw was that the bulkhead walls did not reach high enough; they stopped only a few feet above the waterline. Once the bow tipped down, water poured over each bulkhead's top into the next compartment, like filling an ice-cube tray. The iceberg opened at least five compartments, one too many. From that moment the sinking was a matter of physics and time, not seamanship. No amount of pumping could reverse the cascade of flooding compartments.

The scale of loss reshaped maritime law. In 1914 nations adopted the first International Convention for the Safety of Life at Sea (SOLAS), still the backbone of ship safety today. It required lifeboat capacity for everyone aboard, since the Titanic carried just 20 boats for roughly half its passengers, plus lifeboat drills and continuous radio watches, because a nearby ship's operator was off duty that night. The United States and other nations also founded the International Ice Patrol, which still tracks North Atlantic icebergs. The wreck itself lay undiscovered until 1985, when a team led by Robert Ballard located it; its slow decay on the seabed now shapes debates about preserving underwater cultural heritage.

Myth: a 300-foot gash sank the ship. Reality: sonar surveys of the wreck reveal a series of narrow slits and buckled plates totaling only about a dozen square feet. Myth: the Titanic was chasing a transatlantic speed record. Reality: it was not built for record speed and was not attempting the Blue Riband, though it was steaming fast through known ice. Myth: cheap steel or weak rivets were the true cause. Reality: cold-brittle metal may have worsened the damage, but the collision and the flooding of too many compartments were decisive. Myth: everyone called it unsinkable. Reality: that claim was largely press embellishment and hindsight legend, not an engineering guarantee.