This is the same room where you got the Ripper weapon for the first time. You can find it inside the Master Override crate next to the upgrade console. Ripper upgrade: In the Machine Shop on the Engineering Deck.Here are the Master Override containers and upgrades I found: To get Master Override clearance you'll need to complete the new 'You are not Authorised' sidequest, which involves gathering Crew Rigs across the ship. While there are upgrades and schematics scattered across the ship, the one guaranteed place to find them is inside containers or rooms locked with Master Override. There are two ways to get upgrades for guns in Dead Space: you'll either find the upgrade while exploring the Ishimura, or you find an upgrade schematic and have to bring it back to the store for purchase. Universal Ammunition takes over in Dead Space 3 for the ammo used as it supports the game's crafting mechanic.There are weapon upgrades in most Master Override crates (Image credit: Motive) In Dead Space 2, Contact Energy is more common than in Dead Space. this suggests that the contact energy is plasma based. in dead space 1 and 2, the Contact Beam, after being shot, ignites the surface it was aimed at, if only briefly, and in small fire. The ammunition has a light orange glow when not collected. The trade-off in this case is necessitating careful management of inventory space. This will net you 1,000 credits per contact energy drop (if sold), as opposed to finding between 300-800 credits, or cheaper ammunition, from lesser necromorphs. Contact Energy should be carried in your inventory frequently, as doing so encourages enemies to drop more of it.

It is a rare and expensive ammunition, which costs 4000 Credits for a stack of two. That is increased to six per slot in Dead Space 2. In Dead Space, four Contact Energy cells can be stored in a single inventory slot. Contact Energy is a form of ammunition used in Dead Space 1 and 2.

Dead space 2 force gun schematic