During the last stages of the work in Culebra Cut it was found that some of the slides were so bad that they were breaking back of the crest of the hills that border the cut. Therefore it was found to be feasible to attack the problem by sluicing the material down the side of the hills into the valley beyond. To this end a big hydraulic plant which had been used on the Pacific end of the canal was brought up and installed beyond the east bank of the cut. A reservoir of water was impounded and tremendous pumps installed. They pumped a stream of water 40 inches in diameter. This was gradually tapered down to a number of 4-inch nozzles, and out of these spouted streams of water with a pressure of 80 pounds to the square inch. These streams ate away the dirt at a rapid rate. The slides did not hold up the completion of the canal a minute, at least to the point of usability. The day that the lock gates were ready there was water enough in the canal to carry the entire American navy from ocean to ocean. That day the big dredges from the Atlantic and the Pacific were brought into the cut, and with them putting the finishing touches on the slides at the bottom, and the hydraulic excavators attacking them at the top, the problem of the slides was solved. Viewing Culebra Cut in retrospect, it proved an immensely less difficult task than some prophesied, and a much more serious one than others predicted. There were those who opposed the building of the Panama Canal because of the belief that Culebra Cut could not be dug, that Culebra Mountain was an effective barrier to human ambition. Also, there were those who asserted that Gold Hill and Contractor's Hill were in danger of sliding into the big ditch and that they were mountains which neither the faith nor the pocketbooks of the Americans could remove. Others saw the handwriting of Failure on the wall in the heaving up of the bottom of the cut, interpreting this as a movement from the very depths of the earth. Still others saw it in the smoke that issued from fissures in the cut, which spoke to them of volcanoes being unearthed and told them that the Babel of American ambitions must totter to the ground. They did not know that these were only little splotches of decomposing metals suddenly exposed to the air, any more than their fellow pessimists knew that the heaving up of the bottom of the cut was due to the pressure of the earth on the adjacent banks.