Rule 1: Don't touch the bunker's delicate ecosystem. This includes, but is not limited to, not touching the 20-foot-tall pile of recyclable materials, the precision-crafted hydroponic garden, or the experimental 3D-printed art piece that is still in the process of being created.
Rule 2: Respect your fellow bunker dwellers' personal space. This means keeping your hands to yourself, especially when it comes to someone else's prized possessions, such as their 1980s vintage Pac-Man arcade machine or their collection of artisanal, small-batch, locally-sourced, gluten-free, organic, vegan energy bars.
Rule 3: Keep the bunker's communal areas clean. This includes, but is not limited to, the bathrooms, the kitchens, and the common living spaces. Don't leave your dirty socks on the floor for someone else to find. That's just gross.
For further reading, check out our subpage on Underground Carpooling Etiquette or our Advanced Bunker Survival Tactics.