Water-logged ladders

A water-logged ladder basically means like the ladder can be placed in water without creating an air-pocket or breaking the ladder.It would be very helpful in  making swimming pools and secret entrances and etc.It can also be very helpful in decorations and under water-mines maybe?And this might be a bit much or it should be a different idea, maybe like iron ladders or maybe different types of wood ladders or in general just more ladders. Like ladders need more attention is what i am asking.