To avoid falling into Event One (the Big Bang), the Doctor must convert mass into momentum by having the TARDIS jettison a quarter of itself. Unfortunately it can not be known which rooms will be ejected.
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This will be simpler, of course, if you go into hover mode first, always remembering of course not to reverse the polarity of the neutron flow. The whole system is on manual now. This is where it starts to get really dangerous.