By order of Lieutenant-Colonel Canker a board of officers had been convened to investigate the matter, and after questioning everybody whom "Squeers" had already badgered with his assertions, threats and queries, they went to the guardhouse and began a thorough inspection of the premises. The wooden building stood in the midst of a waste of sand blown in from the shore line by the strong sea wind. It was perched on something like a dozen stout posts driven into the soft soil and then the space between the floor level and the sand was heavily and stoutly boarded in--thick planks being used. Between the floor and the sand was a space of about eighteen inches vertical, and a dozen men could have sprawled therein--lying at full length--but to escape would have required the connivance of one or more of the sentries surrounding the building and the ripping off of one or more of the planks. In his keen anxiety Canker accompanied the Board on its tour of investigation--a thing the Board did not at all like--and presently, as was his wont, began running things his own way. It had been found useless to question the soldiers of the guard. Not a man could be found to admit he knew the faintest thing about the escape. As for the prisoners, most of them reckless, devil-may-care rascals, they grinned or leered suggestively, but had nothing to tell. "We'll have this boarding ripped off," said Canker decisively, "and see what they've got secreted under there. I shouldn't be surprised to find a whisky still in full blast, or a complete gambling outfit--dash, dash 'em to dash and dashnation! Send for a carpenter, sergeant." The carpenter came, and he and two or three of the guard laid hold of one end of the plank after its nails were drawn, and with little exertion ripped it off the other posts. Then everybody held his breath a minute, stared, and a small majority swore. So far from its being open to cats, cans and rubbish, the space on that side was filled solid with damp, heavy sea sand--a vertical wall extending from floor to ground. Canker almost ran around to the opposite side and had a big plank torn off there. Within was a wall as damp, solid and straight as that first discovered, and so, when examined, were the other two sides provided. Canker's face was a study, and the Board gazed and was profoundly happy. At last the colonel exploded: "By Jupiter! They haven't got away at all, then! There isn't a flaw in the sand wall anywhere. They must be hiding about the middle now. Come on, gentlemen," and around he trotted to the front door. "Sergeant," he cried, "get out all the prisoners--all their bedding--every blessed thing they've got. I want to examine that floor."