Why would you want the pool and bowling alley?
Sounds like the bunker doubles as a basement/rec room, which would be the smart way to use it. One would want a smaller, concealable area for food, water, weapons, etc., but there's no reason the entire facility has to be dead space -- especially since the chances of ever needing to use it as a bunker are (hopefully) remote, and you will be wanting to sell the house someday.
Because when you are done bowling, you can use one of the bowling balls to play Water Polo in the pool.