The "something further" proved to be the pith of an Admiralty communication just imparted. Early that morning a British Submarine on North Sea Patrol duty (we will call her E-131), upon returning to the surface to ascertain the cause of defective submergence, had discovered a brown leather lock-strap to be entangled with her aft diving-plane on the starboard side. A leather satchel firmly attached to the other end of the strap was jammed under the plane, and subsequently extricated by one of the men, from the collapsible. Perhaps you can imagine the Lieutenant Commander stooping over the retrieved bit of flotsam, lying under the shaded electric light hanging over the narrow sliding table that pulled out from under his bunk in the officer’s cabin—a place of privacy again, the steel bulkhead-doors being shut. For when you submerge they are all thrown wide so that the Commander’s eye may traverse the whole length of an elongated engine-room, and see what every man is doing at his particular post, in a single flash. The Commander’s eye was screwed up in the vain endeavour to see under the flap of the locked satchel. He took up the thing and turned it in his hands, while the strap, soaked and twisted by sea-water and engine-power, flapped upon his knees like a long frond of wet seaweed. "Wonder who cut the strap?" Clumsily, as though by a blunt knife wielded by a numb hand—it had been hacked through, and the satchel scratched badly in the process. He went on: "Looks like some rich American globe-trotter’s travelling-satchel. No picking these locks! One might negotiate ’em with the oxygen flame-puff—if it wasn’t for the risk of damaging the wads of dollar bills that might possibly be inside. Nothing to be done but rip or cut the leather—and that seems to be made strengthy with metal, somehow!" He slipped the lean blade of a penknife between the strongly stitched edges. The satchel proved to be lined with thin plates of aluminium. "As easy to get inside as the Bank of England!" he grumbled, and so it proved, if the Bank of England has ever been negotiated with a bull-head tin-opener. Inside the leather case lined with aluminium, a little sea-water had penetrated, patching with damp a small antique portfolio of pearly, bossy shark-skin exquisitely painted with birds and foliage by some old-world Japanese master of Art. The quaintly feeble lock, and corner-guards were of bronze, gold-inlaid with scowling fox-masks, and the inevitable chrysanthemum. The Japanese lock gave at a twist of the penknife-blade and then the portfolio disgorged its loose sheaf of yellowed papers strung together by a clew of faded silken twist. Drawings to scale and plans: sheets of manuscript and pages covered with the symbols used in chemical formulas, scribed in a clear small rounded hand. "Great Scott!—what’s this?"