When you patrol moon it's the very first area. I usually go up the hill and go into the two caves ahead of you, then go right and check the first little building and on top of it, then go further right and check the cave where the enemies spawn over there. Then check around where the mission light is, then over where there are normally two of them invisible vandals. Whilst doing all of this keep an eye out for helium on the floor. Then after the invisible vandals I go back to that mission marker and jump up onto the catwalk and walk/look all the way down [b]both[/b] sides as there's usually a chest up there. Whilst up there, again, keep an eye out for helium on the floor. By now you should be over the two small buildings, by the big building which you do the first moon mission on. Check both of these buildings and on top for chests/helium. Look around the edge to the left of these buildings, up on the platform near the mission marker near there too (usually one at the back of the platform). Then go into the bigger building, usually has a Servitor in. There are two dark rooms in this building, check them, as well as the floor in the larger main room. There can also be one up on some pipes on the ceiling of this room. Then come out of the big building and look left, there's another cave over there. Then use the big cylinders nearby to check the catwalk again. Finally, go back to the centre area but up the hill where there's usually some vandals and dregs, check the building next to them, there's a room in the back that can contain a chest as well as the platform at the top of this room. This room also leads down to ([b]have no idea what this place is called[/b]) a big cave thingy with two knights guarding it. There's a spawn cave down there that they come out of which can contain a chest. Then, repeat. Sorry it's so longwinded, not easy explaining it, but it is very easy doing it and doesn't take long at all. So many places to find chests and helium in this area, plus some easy random events. Good luck!