Xiyu Ammunition Depot. We often use the phrase 'walls of bronze and ramparts of iron' to describe the sturdiness of a building, but the Xiyu Ammunition Depot is truly made of bronze and iron! The Xiyu Ammunition Depot includes. We often use the phrase 'walls of bronze and ramparts of iron' to describe the sturdiness of a building, but the Xiyu Ammunition Depot is truly made of bronze and iron! The Xiyu Ammunition Depot includes earth-sheltered cool ammunition depots and cave-type ammunition depots, commonly known as 'walls of bronze and ramparts of iron.' It is a rare example of early Japanese colonial military architecture and one of the four major ammunition depots in the Japanese military fortress on Penghu Island. We often use the phrase 'walls of bronze and ramparts of iron' to describe the sturdiness of a building, but the Xiyu Ammunition Depot is truly made of bronze and iron! The Xiyu Ammunition Depot includes earth-sheltered cool ammunition depots and cave-type ammunition depots, commonly known as 'walls of bronze and ramparts of iron.' It is a rare example of early Japanese colonial military architecture and one of the four major ammunition depots in the Japanese military fortress on Penghu Island. As the name suggests, the Xiyu Ammunition Depot was primarily used for storing artillery ammunition. The cave-type ammunition depots come in two types: single caves and double caves, which are dry ammunition storage facilities. They stored two different types of gunpowder: one with smoke and one without smoke. The cave-type ammunition depots feature a double-layered wall and dome structure. First, a circular arched cave was excavated into the bedrock of the mountainside. An outer structure was built using concrete blocks, and then an inner storage space was constructed with reinforced concrete. To store smokeless gunpowder, in addition to maintaining constant temperature and humidity, the adjacent walls are covered with copper sheets to completely isolate electromagnetic pulse waves and moisture. As for the earth-sheltered cool ammunition depots, they are above-ground structures with an outer
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Penghu