Originally with only the head appearing from the sand in the swash zone at the beach. When poked at by bystanders, he retreated deeper into the sand.
Tide was receding and he appeared distressed (likely due to all the attention he was getting in a crowded beach).
Reappeared 20 minutes later. Someone dug him up then released him back to the surf and he swam away. Seemed to have gills just behind the head.