Grass snakes

Just come accross a family of grass snakes on my allotnent.They are nesting under the pond liner...because the pond is not at the full level the liner is easy to lift up.One of the snakes swam accross the pond and slithered under the liner,tht is how i found the nest....i had to be brave and lift the liner up with one hand while taking photos with the other....yikes!!!!