4 reflection seismic profiles probing the subsurface down to 1000 m above the Gotthard base tunnel (9 km total)
| Category | Engineering geology |
| Country | Switzerland |
| Project period | Nov 1994 - Jan 1995 |
| Number of lines | 4 |
| Total length (m) | 9,000 |
| Depth (m) | 1,000 |