As reckoned by the almanac, it was the 15th of September, more than sixteen months since Cosmo had sent out his first warning to the public, when the Ark crossed the meridian of seventy-four degrees west, in about forty-one degrees north latitude, and the adventurers knew that New York was once more beneath them. There was great emotion among both passengers and crew, for the majority of them had either dwelt in New York or been in some way associated with its enterprises and its people, and, vain as must be the hope of seeing any relic of the buried metropolis, every eye was on the alert. They looked off across the boundless sea in every direction, interrogating every suspicious object on the far horizon, and even peering curiously into the blue abyss, as if something might suddenly appear there which would speak to them like a voice from the past. But they saw only shafts of sunlight running into bottomless depths, and occasionally some oceanic creature floating lazily far below. The color of the sea was wonderful. It had attracted their attention after the submergence of Mount Everest, but at that time it had not yet assumed its full splendor. At first, no doubt, there was considerable dissolved matter in the water, but gradually this settled, and the sea became bluer and bluer--not the deep indigo of the old ocean, but a much lighter and more brilliant hue--and here, over the site of New York, the waters were of a bright, luminous sapphire, that dazzled the eye. Cosmo declared that the change of the sea-color was undoubtedly due to some quality in the nebula from whose condensation the water had been produced, but neither his own analyses, nor those of the chemists aboard the Ark, were able to detect the subtle element to whose presence the peculiar tint was due. But whatever it may have been, it imparted to the ocean an ethereal, imponderous look, which was sometimes startling. There were moments when they almost expected to see it expand back into the nebulous form and fly away. CHAPTER XXV NEW YORK IN HER OCEAN TOMB During the long voyage from the sunken Himalayas to still deeper sunken New York, De Beauxchamps, with his fellow-countrymen and the skilled mechanics assigned by Cosmo Versál to aid them, had finished the construction of the huge diving-bell. No one not in the secret had the slightest idea of what had been done, owing to the remote situation of the deck on which the construction was carried out.