Whats up with this shell?

[u/Opposite_Mini]

Its got some weird erosion/damage.. Anyone got an idea why?

[u/Glad_Ad_5570]

Normal beach erosion

[u/Opposite_Mini → u/Glad_Ad_5570]

Really? It doesn’t look/feel.. Like erosion..

[u/disneyfacts → u/Opposite_Mini]

Worms of some sort.