This picture was taken after only a few days of rainy and wet weather. The basement had a very small leak, but that is all it takes sometimes. The mold spreads right up the wall, often times it grows behind (on the back side of the wall) and you can't even see it. However, you will smell it. It is one of those smells that most people associate with "Grandma's Basement."
Many people will store things in the basement for convenience. Sometimes they are awards that the kids won in elementary school, older family photos, or holiday decorations. I've even seen wedding dresses, more then once. The thing to remember is that water on the basement floor is really bad for anything like cardboard or wood. That water evaporates and raises the humidity, and that will ruin anything that isn't even touching the floor.
Most painted contain latex, and that comes from a plant. Therefore, most paints contain organic material. Anything organic, or once alive, can grow mold. This will ruin the drywall in your basement and it smells musty and gross.
I sump hole is nothing more than a hole in the ground. It does absolutely nothing for you is there isn't a pump in it. These holes are common in basements. DryZone will upgrade those small and useless holes to a great and fully functioning sump pump.
You can see the discolored concrete in the hole. This is a sign that dirt has come in with the water and left stains. Basically, it tells us that there has been water in the sump pit. With no sump pump, that water just sits there like a swamp. Its also very dangerous for small children and pets, they could fall in very easily.
This is what happens to a basement with no perimeter drainage or "french drain" system. There was a sump hole, but no sump pump in it. Mold spreads quickly up the drywall and all over the cardboard boxes that the family used to store things in the basement.