Unfinished Tunnel is an optional dungeon location in Octopath Traveler II.
In order to enter, players must knock out the foreman standing guard at the entrance. A terrible monster called Manymaws has invaded the mine, driving the miners out and paralyzing those who could not escape. Defeating it completes a sidequest and restores the miners to work in safety.
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- The Unfinished Tunnel is a tribute to the Derelict Mine from the original Octopath Traveler, as both are optional dungeons themed around mines and inhabited by Manymaws.