Had a think about how to fish your hidden lakes.
If you put an inline bubble float on your main line,then a bead,and then a swivel,you could have a leader without a weight(at a length that's convenient to cast)
You can put a stop knot on your main line to the depth you want to fish,and adjust it to suit.
You can use any bait you fancy.
With the bubble float partially filled with water for the weight,you could cast almost any distance you wanted,and any depth.
You could even spin with it and use any lure you fancy.
If you are looking for the fish,you can cover any distance or depth.
If you have trouble getting the hook and bait down,you could add a couple of weights.
It's a simple setup.
Are you having another go at the lakes?
The setup would work in the sea,you can set the depth to just over weedbeds or rocks.