トンネル

とんねる
noun
tunnel
1. tunnel
An underground passage, especially one built through a hill or under a road, river, or other obstacle.
When we emerged from the tunnel, we could see the ocean.
トンネル()ける = to pass through a tunnel
The tunnel through this mountain is 5 kilometers long.
There was traffic congestion due to tunnel construction.

トンネル is a loanword from English "tunnel." Japan is mountainous and has an extensive network of tunnels for roads and railways.

COMMON COLLOCATIONS:

FIGURATIVE USAGE:
トンネル()ける is also used figuratively to mean emerging from a difficult period — e.g., 不況(ふきょう)トンネル()ける (to emerge from a recession).

LITERARY REFERENCE:
The famous opening of Kawabata Yasunari's novel 雪国(ゆきぐに) (Snow Country): 「国境(くにざかい)(なが)トンネル()けると雪国(ゆきぐに)であった」 (The train came out of the long tunnel into the snow country).