How to make a bunker completely undetectable?

Bunker under garden shed.

The shed has a concrete floor with a trap heavy metal door. It's not all that deep, 10 feet total. It is however larger that the garden shed. I have an 8 foot ceiling and the bunker is 12X16 made of re enforced concrete. Ventilation is done through a stove pip type of exhaust and venting is in the garden shed. I use 12V fans to circulate the air.

cot beds
Commercial shelving with canned food
Crank radio
CB radio
Board games
battery bank (deep cycle marine batteries)
solar panels ( for later )
Water and a reverse osmosis filter system
Para cord
Candles
Lighters/matches
Clothing
Baby wipes
towelettes
Soap
Amo
p-22 hand gun
fruit and vegetable seeds
Plant seeds ( medicinal)




The hardest part of the entire project was to figure out how to get rid of human waste. But...In the end I figures that with a couple of 45 gallon drums, we could wait out the "storm" for a bit until we could boil it and use it as manure for growing new foods. The shelter has recently been upgrated with LED lighting as well.

It's a work in progress and I don't claim to have all the answers or even The right shelter but....It is a fun project and a great place to go when the inlaws are in town...LOL....Total escape !!!