Around 2:10 am, the stern rose out of the water, exposing the propellers, and by 2:17 am the waterline had reached the boat deck. The last two lifeboats floated off the deck, collapsible B upside down, collapsible A half-filled with water after the supports for its canvas sides were broken in the fall from the roof of the officers' quarters. Shortly afterwards, the forward funnel collapsed, crushing part of the bridge and people in the water. On deck, people were scrambling towards the stern or jumping overboard in hopes of reaching a lifeboat. The ship's stern slowly rose into the air, and everything unsecured crashed towards the water. While the stern rose, the electrical system finally gave way causing the lights to go out. Shortly afterward, the stress on the hull caused Titanic to break apart between the last two funnels, and the bow section went completely under. The stern section righted itself slightly and then rose vertically. After a few moments, at 2:20 am, it also sank.[74]As the ship fell into the depths, the two sections behaved very differently. The streamlined bow planed off approximately 2,000 feet (610 m) below the surface and slowed somewhat, landing relatively gently. The stern plunged violently to the ocean floor, the hull being torn apart along the way from massive implosions caused by compression of water tight compartments inside the ship. The stern smashed into the bottom at considerable speed, grinding the hull deep into the silt.[74]
After steaming at 17.5 knots (32.4 km/h) for just under four hours, RMS Carpathia arrived in the area and at 4:10 am began rescuing survivors. By 8:30 am she picked up the last lifeboat with survivors and left the area at 08:50[76] bound for New York.[75]
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