For Zelensky, Nato and the U.S, whatever lies hidden within the bowels of the Azovstal steel plant MUST REMAIN hidden. Perhaps there are high level Nato VIPs who were unable to withdraw before the plant was surrounded. This would certainly make sense of the multiple Ukrainian night helicopter extraction attempts which were all discovered and destroyed.
Perhaps there is even something more important beneath the plant. Something that, if discovered and made public, would turn Worldwide opinion against the Zelensky regime. Perhaps the secrets of Azovstal would reveal the very nature of this Cabal directed proxy war against Russia.