I am a Genius! Hidden/Secret Mine Shaft Entrance

Idea: Want to make a mineshaft under my house.

Problem: Want to make the entrance look inconspicuous (despite it's single player) and not stand out when not in use and the switch is removed.

Solution: Use sticky pistons to push and pull the block and a piston to push the block up. Use a NOT gate (red stone torch).

Problem: How to get down without breaking neck, and able to get back up.

Solution: Water Elevator! Ladders will only prevent blocks from being moved or get detached from the wall.

Problem: Water will disappear if there is a solid block on the source water block.

Solution: Put the source block one block away from the path of the solid block and sticky piston. Place it under a block and to the side.