Every now and then, I find my turtles going to the highest point in their water container with one climbing the other and fully stretching out their heads.They stay this way for quite a while. It is cute but looks weird as I have no expertise.

They stay still all the time and are misaligned for copulation. So it is not that.

What are they doing? Scouting? Sea nostalgia? Daydreaming about being celebrities and Posing for camera? Ventilating?