AN UNSINKABLE TITANIC
minutes' time. This was what happened to our own battleship Maine in Havana harbour, and to the Russian battleship Petropavlovsk and the Japanese battleship Hatsuse at Port Arthur.
Enough has been said to prove that when the naval architect undertakes to build a hull that will be proof against the blow, not merely of one but of several of these terrific weapons, he has set himself a task that may well try his ingenuity to the utmost. Protection by heavy armour is out of the question. The weight would be prohibitive and, indeed, all the side armour that he can put upon the ship is needed at the water-line and above it, as a protection against the armour-piercing, high-explosive shells of the enemy.
Heavy armour, then, being out of the question, he has to fall back upon the one method of defense left at his disposal,—minute subdivision into watertight compartments. Associated with this is the placing at the water-line of a heavy steel deck, known as the protective deck, which extends over the whole length and breadth of the hull and is made thoroughly watertight.
The double-skin construction, which was used
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