  A recent paper of Dias and Silvera (DS) reports on production of metallic
hydrogen in a diamond anvil cell at 495 GPa at 5.5 and 83 K. The results are
implied to have a great impact on energy and rocketry. Here we argue that the
presented (very scarce) results are contradictory with the presented
experimental description making their claims unsupported experimentally.
Moreover, the proposed implications are highly speculative making this paper
very confusing for a broad audience. Elucidating the claims and the related
implications is important for building a coherent picture that is currently
emerging as the results of theoretical calculations at various levels and
experimental investigations employing static and dynamic compression
techniques. There is no doubt that hydrogen metallizes at high pressures. But
this does not make all claims about reaching this state immediately valid.
Scientific community would like to learn at what conditions hydrogen
metallizes, what is the nature of the conducting state and its properties (e.g.
superconductivity). Here we argue that the presented data do not provide any
reliable information on this.
