Episode 5: Following the trail of the gem, Wolfoo continues to go to Talpa Mine – Hidden Diamond of the mole. Unluckily, Wolfoo was falsely accused of being a diamond thief and rushed to the Death Mine to work.
In the Death Mine, Wolfoo helped Tass – the fastidious mole – solve the mystery and find the real diamond thief. Right after, he achieves the 3rd piece of gem from that thief.