Secret Heart

The Secret Heart was one of the last of Racnoss spacecrafts after the war between the Racnoss Empire and the Fledgling Empires. It was similar in design to the Empress of the Racnoss' ship, the Webstar, and was also powered by Huon energy.

Roughly 4.6 billion years ago, the Secret Heart escaped from the Empires when it entered the Sol system. However, it became trapped inside the Earth as it was formed, attracting rocks to it and trapping itself. In 2007, Huon energy created by Torchwood was available to awaken the Secret Heart's crew, but the escaping Racnoss were drowned when the Doctor blew a hole in the underground chamber and the River Thames was drained, its water flowing to the crew. (DW: The Runaway Bride)