Battlestations: Midway/Crucial Cargo

Primary Objectives
 * Destroy the two specified cargo ships

Hidden Objectives
 * Sink all escorting warships
 * Sink all the cargo ships

This mission is easy to win at, but difficult to fully beat. Despite the fact that you have over 30 torpedoes, even if you have 100% accuracy with all your torpedoes you cannot sink the entire convoy, the two cruisers, and the two escorting destroyers with all of them.

The challenge is made even more complicated by the presence of PT boats, which are too shallow for you to torpedo. Additionally, once you sink all the enemy ships, enemy planes with depth charges start harassing you, so this challenge mission's hidden objectives are extremely difficult.

Approaching the Convoy
The ships you have to sink are different every time, but fortunately even your submarine can outrun them, so they should be a no-factor. What should be on the forefront of everyone's mind is the destroyer - the Yuguri - which quickly approaches you to try and hit you with depth charges. Perform the head-on attack against it (this is the best place to practice the head-on attack) to sink the warship. Otherwise crash-dive to depth level 4 and try smacking it with your rear torpedo tubes if you can (doing so entails a LOT of damage from the destroyer's depth charges)

Once the destroyer is dealt with, raise your periscope and look around. The computer will notify you once you've spotted a mission critical target and it will remain under a gold objective bracket for the duration of the mission.

Once you're in position, fall in trail with the two cruisers. They are positioned in front of the ship, and the heavy cruiser is a larger easier target and is in front, so head for that one first. It takes all four torpedoes to send it down. It will speed up once it spots your torpedoes coming, so fire as close as you can. Also watch for another destroyer - use the tactical map to keep track of enemy movements. Sailing along the port side of the convoy is the light cruiser Kitakami. It takes about three or four torpedo hits to sink the light cruiser. Once this ship is done, smack the destroyer behind you with your rear torpedo launchers before surfacing for some air. Use the merchant ships as cover to hide from the enemy warships, if they're still around. The enemy destroyers in particular have to get on top of you, and you can sail under a cargo ship and force the enemy to come about and take the long way.

The mission ends when the two cargo ships are sunk, but if you want the secret objective, you have to sink the whole convoy. Unfortunately, you don't have enough torpedoes to sink everything. Unfortunately, therefore, you must rely on your deck gun. Aim for the cargo containers and do your best to arc shots on top of them to send them to the bottom. Your machine gun can try and take potshots against the enemy PT boats, but ultimately it won't do much.

Once you've removed both critical cargo ships, the mission is complete.