[On closer inspection, the dead end turns out to be... still very dead. However, it seems that it was a proper tunnel at one point, but got cut off by a rockslide or something similar, and over the years it's formed to be a rather solid wall. There's no passing through this, at least not without the help of a Ground or Rock-type Enlightened or Pokemon.
But if Jade and Erwin do manage to get that lamp, the light will show that the wall to the left of the dead end doesn't posses the same wall-y qualities as the rest of the tunnel. It does look barricaded as well, but seems to have been made in a haste and isn't nearly as solid as the sealed-off main tunnel. If Jade and Erwin pay attention, they'll find that it was also the source of the earlier chilling breeze, although it is much weaker now. Looks like it's possible to go through here!]
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But if Jade and Erwin do manage to get that lamp, the light will show that the wall to the left of the dead end doesn't posses the same wall-y qualities as the rest of the tunnel. It does look barricaded as well, but seems to have been made in a haste and isn't nearly as solid as the sealed-off main tunnel. If Jade and Erwin pay attention, they'll find that it was also the source of the earlier chilling breeze, although it is much weaker now. Looks like it's possible to go through here!]