The celebration held when the excavation of a tunnel or another underground structure reaches its deepest point (implying completion), in which it is ceremonially tarred (originally to protect against moisture).
The celebration held when the excavation of a tunnel or another underground structure reaches its deepest point (implying completion), in which it is ceremonially tarred (originally to protect against moisture).
The celebration held when the excavation of a tunnel or another underground structure reaches its deepest point (implying completion), in which it is ceremonially tarred (originally to protect against moisture).
The celebration held when the excavation of a tunnel or another underground structure reaches its deepest point (implying completion), in which it is ceremonially tarred (originally to protect against moisture).