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Gitchak nakana has some wild adaptations: lacks externally visible eyes, appears mostly transparent and shows a reddish life color, and even its brain is just covered by skin (no skull roof at all).
These features help it survive in pitch-dark groundwater where food is super scarce and relatively few fish species worldwide live underground (around 300), and far fewer are known from aquifers.

The team behind the discovery began collecting these fish in 2021 and published their findings recently.
This adds to India's reputation as a hotspot for underground fish diversity—states such as Meghalaya and Kerala have multiple known subterranean species, showing there's still plenty left to discover beneath our feet.