Filming primarily took place between 9 July and 11 August 2007; the first scene filmed depicted the group being accosted by the Host while crossing over the engines. On 12 July, Tennant's mother, Helen McDonald, began to succumb to her cancer. Filming was rescheduled to allow Tennant to be present when she died and was buried; she died on 15 July and was buried on 21 July. During Tennant's absence, scenes in the "Titanic"'s reception area were filmed at the Exchange in Swansea and the Coal Exchange in Cardiff Bay. Tennant filmed his scenes in the area on 16 and 17 July. The last use of the Coal Exchange was on the 18th; scenes depicting the ship's collision with meteors were filmed on that day.