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| Drain 2 ... AMS Horizontal (normal) ... Drain 2. |
| Drain 4, Drain 1, Subsidiary Drain 2, and Drain 2. From the south ... Scanned 2005 for the 75th anniversary exhibition and publication. 673 Horizontal (normal) ... May 1932 ... Drain 4, Drain 1, Subsidiary Drain 2, and Drain 2. |
| Drain 4, Drain 1, Subsidiary Drain 2, and Drain 2. From the south ... AMS north 673 Horizontal (normal) ... 1 May 1932 ... Drain 4, Drain 1, Subsidiary Drain 2, and Drain 2. |
| Room A, Drain 2 ... AMS 1248 Horizontal (normal) ... 16 Jun 2004 ... Room A, Drain 2. |
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