A tunnel is a type of obstacle in Pikmin 3. Some walls have tunnels in them which serve as shortcuts between two parts of an area, but when these walls are first found, they are covered in pebbles and dirt. Pikmin must be ordered to open the tunnel, where they will slowly begin cleaning up the clutter. The tunnel cannot be entered until all the gravel has been removed.
There are two phases for digging a tunnel. The first phase consists in digging the entrance to the tunnel, and the second one consists in digging inside the tunnel. During the first phase, different Pikmin types will dig at different speeds, whereas in the second one, every Pikmin will dig at the same speed. The following table lists relative digging speeds, based on the most "normal" Pikmin type, the Blue Pikmin.
It's possible to see that Yellow Pikmin are not given any speed improvement, compared to when they are digging a buried fruit, in Pikmin 3.
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