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In their article [arXiv:1705.03394], 'That is not dead which can eternal lie:the aestivation hypothesis for resolving Fermi's paradox', Sandberg et al. tryto explain the Fermi paradox (we see no aliens) by claiming that Landauer'sprinciple implies that a civilization can in principle perform far more(${\sim} 10^{30}$ times more) irreversible logical operations (e.g.,error-correcting bit erasures) if it conserves its resources until the distantfuture when the cosmic background temperature is very low. So perhaps aliensare out there, but quietly waiting. Sandberg et al. implicitly assume, however,that computer-generated entropy can only be disposed of by transferring it tothe cosmological background. In fact, while this assumption may apply in thedistant future, our universe today contains vast reservoirs and other physicalsystems in non-maximal entropy states, and computer-generated entropy can betransferred to them at the adiabatic conversion rate of one bit of negentropyto erase one bit of error. This can be done at any time, and is not improved bywaiting for a low cosmic background temperature. Thus aliens need not wait tobe active. As Sandberg et al. do not provide a concrete model of the effectthey assert, we construct one and show where their informal argument goeswrong.

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