This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A strongly built room, or vault, where valuables may be stored in safety

n. a burglarproof and fireproof room in which valuables are kept

"But they could have started last night, they had started last night for there had been no diving-boat in the Dubh Sgeir boathouse, and reports from the Nantesville's owners had indicated that the strongroom was a fairly antiquated one, not of hardened steel, that could be cut open in a couple of hours with the proper equipment."

storeroom    storage room    stowage   

vault    bank vault   

batlike    bandoleer