This 27-foot diameter bulkhead with its swinging door was installed at the north end of SPC No.1 in 2005. The former tunnel test section is located on the other side of this bulkhead.
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This 27-foot diameter bulkhead with its swinging door was installed at the north end of SPC No.1 in 2005. The former tunnel test section is located on the other side of this bulkhead.