At 11:40 PM on April 14, the Titanic struck the iceberg on its starboard (right) side. The collision caused significant damage to the ship's hull, but it was not immediately apparent how severe the damage was. The ship's watertight compartments were designed to supposedly keep the ship afloat even if four of them were flooded. However, the damage exceeded that threshold, and water began pouring into the ship at an alarming rate.