Hello! Today I will show you a 100% hidden base exit this works perfectly with my hidden passcode locked base entrance this is probably one of the easiest builds I can show you.
Step 1: Materials
You will need
Dig a 1x1 hole going all the way down to your base
Place ladders except for the very top block
Break the block that I have if you don't it will not work
Patch up the block where the hole is
Add 2 powered rails going into the block you just placed
Put a minecart on the rails
Power the rails with whatever you want
Push the minecart and it should go into the block
Break the rails and the torch
Then patch up the last hole
At the bottom of my screen you will see a ride button press that or right click then you will be in the minecart just spam jump whilst walking forward.
Hope this turns out all right for you:)