The map CavedIn takes place in an abandoned mine. Players will spawn right next to their rescue boat, and will have to head for and open the blast door.
Once opened, you are required to find a total of 4 gas tanks and place them into a power generator that sits next to the elevator lift.
Find the TNT
After all gas cans are found, 3 TNT sticks will spawn and must be found. They can spawn at 5 different locations around the map, so it's best to try and remember where those locations are.
Once all 3 TNT sticks are placed into the crate, a survivor must step on the detonator. Thus exploding the box of TNT destroying the wall and allowing players to enter into the final objective area of the map.
The 6 Supplies to be found
And finally, once inside the storage area, 6 items are needed before you can race your way back to the boat and claim your victory. Those 6 items will differ from a radio, a stick of meat, a compass, a little green GPS, a pair of goggles (forgot what they are called, you use them for your eyes when you can't see something from afar) and what it looks to be a light blue hat possibly.
Get back to the boat
After all 6 items are found, a timer will begin to count down from 1 minute. Leave the storage area quickly and head for the boat, closing the blast door behind. That is, if it's not broken yet. Sit yourself in the boat and claim your reward. Survivors in the boat are highly exposed to Smokers and Cavebats, and a Tank can easily trap and kill the unfortunate Survivor who chooses to sit in either of the two pilot rooms.