Alfred and Henk travel to an oli rig where the drill always breaks for unknown reasons. Pikkie, who is on the rig because of the dissappeared diamond drills, wants to find out if the diamonds really disappeared during drilling. The three go into the depths with a submarine.
Continues in Atlantis (They Come To Atlantis)
Tropes:
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Unexpected Character: Pikkie shows up in an unexpected place after a long absence.
