Try Deep Earth Fishing in A Game About Digging A Hole. Catch unique Cave Fish and Aquatic Gems from Subterranean Lakes using a Basic Fishing Rod.
Once you discover underground water sources or 'Subterranean Lakes' (typically below -200 meters), you can engage in Deep Earth Fishing. Craft a 'Basic Fishing Rod' (3 Wood Sticks, 2 String - from 'Cave Spider Silk'). Different depths and lake types yield unique 'Cave Fish' and rare 'Aquatic Gems'. Some fish provide powerful temporary buffs when consumed.

Best Spots: Look for large, still bodies of water. The 'Crystal Lake' at -450 meters is known for its rare 'Glowfin Trout' and 'Deepsea Pearls'.
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