Site preparation for the GAST project : Sealing of the water conducting features, cutting of the plug seat, preparation of the tunnel floor and the tunnel rail and casting.

Sealing of water conducting features

Sealing of water conducting features

Cutting of plug seat

Cutting of plug seat

Cutting of plug seat

Cutting of plug seat

Preparation of tunnel floor

Metal framework with the cabling for the measurement instrumentation for the GAST experiment (© Comet Photoshopping)

Tunnel rail and casting

Gas-Permeable Seal Test (GAST)