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| West Branch of the Great Drain showing diagonal cutting through the wall of the Great Drain, for the Roman drain, after clearing away fallen stones ... south 8349 Horizontal (normal) ... 11 Apr 1956 |
| Great Drain bridged for the East-West Street ... south Horizontal (normal) ... May 1948 |
| Great Drain just north of the State Prison, showing built wall of the prison. Corridor drain at lower left ... 3903 Horizontal (normal) ... November 1949 |
| Great Drain below with cover slab; above, "bridge block", earth and tumbled breccia blocks ... north Horizontal (normal) ... 14 Apr 1948 |
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