| 摘要 |
A protection structure, according to the present invention, comprises: an airtight chamber which is connected to a chamber to be protected and maintains or releases air tightness by an air lock system; an inner door which is installed in one wall of the airtight chamber for the access between the airtight chamber and the chamber to be protected; and an outer door which is installed for the access to the outside and is installed in the wall except for the wall facing the inner door among the walls of the airtight chamber. Therefore, the present invention efficiently defends against intruders, such as pirates. |
