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| The Great Drain just to the south of the railroad wall ... south 2191 Horizontal (normal) ... 8 March 1955 ... The Great Drain just to the south of the railroad wall. |
| The Great Drain just to the south of the railroad wall ... AMS south 2191 Horizontal (normal) ... 8 March 1955 ... The Great Drain just to the south of the railroad wall. |
| Middle drain to the north of Building C, as cleared to bottom ... AMS south ... 24 May 1938 |
| Middle drain to the north of Building C, as cleared to bottom ... south Horizontal (normal) ... 24 May 1938 |
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