Also, once the tunnel collapses completely, you can enter it from a small hole on the other side, and find a concussion rifle in there.
Also, those lightnings there are fun... they appear to flash seemingly randomly, so there's no way to predict when/where the next one will be. One successful zap makes Mara say "Ooh!"; another successful zap will make her say "Uh-oh!!!", and yet another successful zap will result in "Nnn--ooh!" and Mara lying down to have a sleep.
Who cooks the cookies, picks the pickles, moves the movies, pins the pinnacles, barns the barnacles, abominates the abominables, where are gibs in a gibbous moon, and finally, who is General Failure and why is he reading my files?