The dense clouds were now upheaved at such short intervals that the scene of devastation was completely shut out from the observers on the hills; but every few minutes they felt a sickening shock, and heard a momentary and horrible crash and hiss which seemed to fill all the air. The instantaneous motor-bombs were tearing up the sea-board, and grinding it to atoms. It was not yet noon when the bombardment ceased. No more puffs of black smoke came up from the distant repeller, and the vast spreading mass of clouds moved seaward, dropping down upon St. George's Channel in a rain of stone dust. Then the repeller steamed shoreward, and when she was within three or four miles of the coast she ran up a large white flag in token that her task was ended. This sign that the bombardment had ceased was accepted in good faith; and as some of the military and naval men had carefully noted that each puff from the repeller was accompanied by a shock, it was considered certain that all the bombs which had been discharged had acted, and that, consequently, no further danger was to be apprehended from them. In spite of this announcement many of the spectators would not leave their position on the hills, but a hundred or more of curious and courageous men ventured down into the plain. That part of the sea-coast where Caerdaff had been was a new country, about which men wandered slowly and cautiously with sudden exclamations, of amazement and awe. There were no longer promontories jutting out into the sea; there were no hillocks and rocky terraces rising inland. In a vast plain, shaven and shorn down to a common level of scarred and pallid rock, there lay an immense chasm two miles and a half long, half a mile wide, and so deep that shuddering men could stand and look down upon the rent and riven rocks upon which had rested that portion of the Welsh coast which had now blown out to sea. An officer of the Royal Engineers stood on the seaward edge of this yawning abyss; then he walked over to the almost circular body of water which occupied the place where the fishing village had been, and into which the waters of the bay had flowed. When this officer returned to London he wrote a report to the effect that a ship canal, less than an eighth of a mile long, leading from the newly formed lake at the head of the bay, would make of this chasm, when filled by the sea, the finest and most thoroughly protected inland basin for ships of all sizes on the British coast. But before this report received due official consideration the idea had been suggested and elaborated in a dozen newspapers.