The Doctor deduces that the freighter is a slave ship loaded up with Tharils to be sold as time machine components, but the immense weight of Rorvik's damaged ship, designed to contain the Tharils, is now collapsing the fragile void of the micro-universe in which they're all stuck, pulling everything inside ever closer. Written by
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Run, Doctor. Scurry off back to your blue box. You're like all the rest - LIZARDS when there's a man's work to be done. I'm sick of your kind: faint-hearted, do nothing, lilly-livered bed-wets! This is the end for all of you. I'm finally getting something DONE!