World 2

Drops
Tips:

After you level up your submarines above level 20 and upgraded to 4-5 stars, you can use them (either solo or both) to grind 2-3 for some Daily and Weekly quests, as well as picking up resources.

Tips
1. You can solo 2-4 using a single submarine with decent luck. (Recommend lvl 20 with 5-stars. However, You will still need to level up your main fleet for later sorties)

2. A more conventional way to finish 2-4 is using 4BB 2CV. (Remodelling all of them and an average level of around 30 is strongly recommended)

3. If you end up going A-B route on 2-4, just end the sortie, you will run out of fuel/ammo by the time you get to boss node.