Running on Samsung Galaxy s8, also typing on same so apologies if there's a typo.

Using half slabs to trap baby turtles is very common in many turtle farm designs. Often, the design is intended to trap the baby turtles, but allow the adult turtles to go free.

Unfortunately, when the adults are under the slab, they seem keen to simply stay there and cannot even be tempted out with sea grass - although they did move in the players direction. They seem capable of escaping since I've seen them push each other up when there are lots of them and, at that point, some of them leave.

This does rather have a negative effect on turtle farms.