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| Northern line of tunnel east of 3a ... Laura Gawlinski ... northwest ... 2 Aug 2018 ... Northern line of tunnel east of 3a. |
| Full extent of tunnel east of 3a ... Laura Gawlinski ... southeast Horizontal (normal) ... 3 Aug 2018 ... Full extent of tunnel east of 3a. |
| Northern line of tunnel east of 3a ... Laura Gawlinski ... northwest 3504 Horizontal (normal) ... 2 Aug 2018 ... Northern line of tunnel east of 3a. |
| Ω, end of season, tunnel east of 3a ... Craig Mauzy ... Same as color 2018.09.0216. northwest Horizontal (normal) ... 7 Aug 2018 ... Ω, end of season, tunnel east of 3a. |
| Ω, end of season, tunnel east of 3a ... Craig Mauzy ... same as color 2018.09.0216 northwest Horizontal (normal) ... 7 Aug 2018 ... Ω, end of season, tunnel east of 3a. |
| Tunnel east of 3a, southeast end, tile supports ... Laura Gawlinski ... east Rotate 270 CW ... 2 Aug 2018 ... Tunnel east of 3a, southeast end, tile supports. |
| Tunnel east of 3a, southeast end, after cleaning ... Laura Gawlinski ... southeast Rotate 90 CW ... 2 Aug 2018 ... Tunnel east of 3a, southeast end, after cleaning. |
| Tunnel east of 3a, southeast end, collapsed structure ... Laura Gawlinski ... southwest Rotate 180 ... 2 Aug 2018 ... Tunnel east of 3a, southeast end, collapsed structure. |
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