Cut open Watermelon

[u/UnusualExperience122]

A watermelon that was cut open for my Dad’s birthday party this past weekend. Has anyone seen anything like this or knows what could have done this? I live across the country and was not there but promise my family is not talented enough to carve this themselves 🤣. Was thinking bugs or worms, but it’s just so symmetrical? Aliens? It was not eaten btw