Armored Core Wiki

Defend Submarine is a mission in Armored Core: Master of Arena. It was remade in Armored Core: Nexus.

Defend Submarine


Armored Core: Master of Arena[]

Sender: Lana Nielsen

Requester: R&G Industries

Reward: 34000

Theater of operations: R&G Industries Steamship Route

Enemy forces: Unknown

Objective: Escort Submarine

Mission Area: Steamship Route

Mission Scene: Submarine

Safety Level: 32

Armored Core: Nexus[]

Client: R&G Industries Area: Ocean Shipping Route Enemies: Unknown Objective: Escort Submarine


Armored Core: Master of Arena[]

Your objective is to escort a marine transportation battalion. You will board an R&G Industries' Transport Submarine and accompany it to its destination.

R&G Industries has become a target of recent terrorist activities, we believe that another attack on the company is imminent.

We have no way to predict what problems might occur en route. Therefore, be prepared to handle any circumstances that may arise.

Armored Core: Nexus[]

With terrorist activity against their interests at an all-time high, R&G Industries has opted to hire an escort to accompany their transport submarine during its next voyage.

Your objective during this mission will be to safeguard the submarine against attacks, and ensure that it reaches its destination safely.

It is impossible to predict what kind of trouble might be encountered during the trip, so prepare your AC as best you see fit.



  • Submarine


Armored Core: Master of Arena[]

Communication:Unidentified units detected behind us. Enemy battle cruiser detected on intercept course. Be careful. Our submarine cannot submerge due to engine failure. Please take care of all hostile forces while we make repairs.

Lana Nielsen:Your AC will be impossible to recover should it fall into the ocean. Avoid this situation at all costs.

Communication:Repairs are almost complete. Please hold them off awhile longer.

Communication:Repairs complete. We will be submerging now. Please return to base.

Armored Core: Nexus[]

Communications Officer:Targets detected off the stern.

Communications Officer:They're enemy battle cruisers, stay alert.

Communications Officer:Problems with the engines are preventing us from submerging.

Communications Officer:Watch our back until repairs are complete.

Lana Nielsen:Take care around the water. Your AC can't be recovered if it falls in.

Communications Officer:The repairs are almost complete. Hang in there.

Communications Officer:Repairs complete. We're preparing to dive, please head back.


Armored Core Master of Arena[]

This mission is fairly tricky as there is limited foothold (the submarine is the only place where you can set down your AC). Be careful not to fall into the water as it will cause you fail the mission. The flying enemies aren’t really a concern though the battle cruiser that shows up after a while might give a little trouble. Just fly over to the battle cruiser & cripple its gun turrets. Once you have destroyed all of the ship’s armaments, beware as destroying the ship will cause you to lose footing on it once it’s blown up. Fly back to the sub & defend it for a while more until the operator tells you that repairs are complete.

Armored Core Nexus[]

The Nexus version of this mission is slightly different from the original. Rather than dealing with many flying enemies & a battle cruiser, you will dealing with torpedoes fired from battle cruisers with a handful of flying enemies.

The torpedoes are your top priority as them hitting the sub will kill your chances of S ranking the mission & getting the secret part. Your best bet would be to use hover legs to float around the sub & pick off the incoming torpedoes as they approach. Don’t bother too much with the flying enemies as they don’t inflict much damage on the sub. Just keep picking the torpedoes until the operator tells you repairs are complete & they’re ready to submerge.