Tunnel
device · 700 BC · Ancient world
An underground structure (Eupalinos).
What it is made of
- Tunnel lining — has part. A lining of concrete or segments.
- Tunnel portal — has part. Tunnel portals.
- Street light — has part. Lighting.
Principles and materials it uses
- Tunnelling shield — uses. Shield tunnelling.
- Dynamite — uses. Drilling and blasting.
- Rock drill — uses. Driving the Mont Cenis tunnel.
- Chisel — uses. Hezekiah’s Tunnel was cut by hand with chisels.
- Mine ventilation — uses. Ventilation.
Where it is used
- Metro — is used in. Tunnels.