The crew assembled on deck in watches, every man drinking in the pure night air--not that the atmosphere 'tween decks was impure, for, thanks to the chemical processes to safeguard the crew, the air was wholesome and capable of being endured without discomfort for days, should occasion arise. Nevertheless the gallant and daring men lost no chance of getting into the open air: for one reason, it economized the oxygen purifiers; for another, the men never knew when a similar chance might occur again. While the submarine was running on the surface, thereby saving the dynamos, since she was being propelled by the petrol engines, opportunity was taken to examine the damage caused by the explosion of the mine. It was found that one of the fore-and-aft girders had been shattered for a length of nearly fifteen feet, and some of the connecting braces and struts had been twisted and buckled. In addition, one of the horizontal rudders had been bent almost to a semicircle, a fact that accounted for the submarine's failure to maintain a given depth without use of the auxiliary ballast. "Your device saved us, sir," remarked Crosthwaite. "Close contact with that mine would have pulverized the plating." "Yes, it has," assented Huxtable. "But unfortunately it wouldn't serve its purpose a second time if we found a mine in the same spot. More than that, the shattered girder is an encumbrance. Instead of warding off the mooring wire of an anchored mine, that jagged projection would foul it, for a moral cert. It will have to come off while we've a chance. We must also unship the damaged rudder and do our best to bend it straight again. If we cannot, it would be better to do without it, and rely upon the port horizontal rudder and the two bow diving-planes." "Will it interfere with the manoeuvring of the vessel?" asked Dick. "Certainly, but only to a certain extent. We won't be able to dive so promptly, but that is all. Needless to say I would rather get the thing ship-shape, if it can be done." While the artificers were busily engaged in cutting away the after portion of the damaged girder, and rounding off the broken part that terminated nearly abaft the after quick-firing gun, others of the crew rigged up a pair of sheerlegs and proceeded to unship the injured rudder, the engines being stopped and the submarine trimmed by its head to enable this to be done. It was soon evident that the men at their disposal were not sufficient to straighten out the buckled plate. It was a job which would have to be undertaken at Malta Dockyard, should the submarine have the good fortune to return from her hazardous mission. "Hard lines!" muttered Huxtable. Then aloud he exclaimed: "Pass the thing below, lads; what can't be cured must be endured."