"Along the Ohio, from this side of Louisville to above Cincinnati, scarcely any property was saved. The depression was such that the submergence came very quickly. But this was not the case in the surrounding country. In one week the shocks were over and the earth quiet. People recovered from their fears a little, and looked about them. Later on they commenced to rebuild, and it was not until a year after that they found a new foe against which they could not combat: the country was below the level of any outlet, natural or artificial, and was filling up into an inland sea. Surveys were made, and in 1918 the true condition of the country ascertained. Then, and only then, was it found that the region now covered by the Central Sea was destined to be lost to mankind. Human ingenuity could not solve the problem of drainage. There was no drainage. Far below the bed of the Mississippi, the only possible outlet, the country was doomed to inundation. The survey was completed and the true limits established. All within that area began to be abandoned. Property, wherever possible, was removed; but the buildings, at least those which could not be taken apart and moved, still remain under the sea as monuments of a once densely populated area. To be sure, the removal was not rapid. The exact time was known, from the surveys made, when the waters would gain their maximum height, or reach to any particular point." "Such an immense basin must have required a considerable time to fill up?" inquired Cobb. "It did--years. It was a gala day at Cairo, and a day of rejoicing throughout the land, when, on the 14th of August, 1939, the Central Sea reached the dam at that city, and passed over in a gently increasing stream. The dam was removed, the channel opened, and navigation from the ocean to this immense body of water, through the mouth of the old Ohio River, was unobstructed." "Why," exclaimed Cobb, in astonishment, "that was twenty-three years after the disturbances! It took longer to fill up than I had imagined." "The area lost," continued Rawolle, "was about one hundred thousand square miles; the volume nearly one hundred and seventy-five trillion cubic feet. The water-shed of the Ohio produced ten billion cubic feet per day, all of which flowed into the Central Sea. The first two years the Mississippi discharged a like amount into the sunken area. It was estimated that over ninety trillion cubic feet of water were pushed up, so to speak, from the strata of the earth by the subsidence of the upper crust. Thus, one hundred trillion cubic feet of water rushed into the doomed basin of the Ohio in the first two years, making inundation very rapid during that time, and frightfully rapid during the first week. The Ohio water-shed supplied nearly four trillion cubic feet per year, which, to complete the seventy-five trillion necessary to fill the sea, took twenty-one years."