You can start Expedition if you are over level 42 in the game.
In
the Expedition, the world is occupied by evil rebel troops. As a hero, you will
lead your fleet to defeat the rebel fleet, take back ports and resource islands
and conquer the sea.
After liberating a port, you will receive a golden pack includes diamonds, parts and medals, and another sea area will be unlocked.
Other
players may invade your islands. They can take the resources from the islands.
Defeat the invaders and you can take back all resources.
You
may encounter Elite Rebel Fleet while exploring a sea area. Defeat them before
they leave, you can get high class medals. If you can’t defeat them now, you
can try again after you are more powerful. There is no limit of challenge
chances before they leave.
You
may find wrecks after every battle or exploring. You can salvage them and get
random rewards.
You
may find some buildings like Alloy Factory, Tech Center, Light House or
Ammunition Black Market. You can upgrade them after unlocked. And you can claim
rewards or purchase discounted items every day.