First you will need 1 piston, 2 redstone 1 lever and 1 glowstone/tnt.
Then dig a three deep hole on the top layer place the lever.
Under the lever dig a 2 deep hole past the lever.
Now put a block of glowstone/tnt.
Go to the surface on the right /left of the block with the lever on dig a two deep column backwards now replace those holes with redstone dust.
Your mine seeker is finished.
To operate jump into the hole and pull the lever to get out reverse the last step.
