eight o’clock
By evening there was still no improvement in our situation . The ice stayed between 400 and 500 meters deep . It was obviously shrinking , but what a barrier still lay between us and the surface of the ocean ! By then it was eight o'clock . The air inside the Nautilus should have been renewed four hours earlier , following daily practice on board . But I did n't suffer very much , although Captain Nemo had n't yet made demands on the supplementary oxygen in his air tanks . That night my sleep was fitful .