In order to solve this multi you need to study the power pumps and work out the following :
1. On Entering the Museum of Power you are greeted with how many Huge Pumps = A
2. The red wheel on the side has how many holes (With nothing in)? = B
3. There are 2 large yellow chambers with an elongated oval hole in it how many bolts are used in 1 chamber = C
4. How many colours are used to paint these pumps = D
The cache can be found at N 51 44. (C+A-B)(A*2)D E000 39. B(D+A)(C-(D+B))