They aren't called burrowers for their swimming ability. These set of models features an individual popping out of a tunnel, another diving back in and an empty tunnel token.
Each stands on a 30mm base, and is to scale with the other Horizon models.
Don't forget the standing burrower: https://www.printables.com/model/645296-burrower-from-horizon-forbidden-west
The author marked this model as their own original creation.