How did the Numenoreans survive in the Cave of the Forgotten?

[Inziladun]

Originally Posted by Elmo

If the Valar could make the Numenoreans live in a cave forever it seems they did lie to them when they said the Numenoreans couldn't become immortals and so the Numenoreans had a legitimate grievance.

If in fact the Valar did indefinitely arrest the physical processes of the Númenóreans in that case, it would have been with the consent of Ilúvatar, who himself had intervened in that situation. At any rate, a suspension of bodily function is far different than true immortality.
Alternately, it could have been the power of the One alone that was responsible for the fate of the mortals there.