The Doctor and Phoebe got to April 10 1912 to see the day the Titanic sank which was the 15th April 1912 The Doctor and Phoebe know there trip is anything but good they can't really interfere  But with The TARDIS the Doctor and Phoebe are able to hold the ship for an extra hour or so hopefully enough time to save people unfortunately they can't stop the inevitable from happening with the TARDIS at the bottom of the Atlantic Ocean the Doctor and Phoebe have to swim for the lives to reach the TARDIS at the sea bed. But can they get to the TARDIS quick enough in order to save the people in the water and can they warm up the Atlantic Ocean to stop freezing to death can the Doctor and Phoebe save more people then the 700 people they were saved