As a captain controlling a submarine, with multiple missiles and attack methods, as well as the ability to change and strengthen the submarine, you will face multiple challenges.

Firstly, you will encounter attacks from marine creatures. In the deep sea, there are various mysterious and dangerous marine creatures that may actively attack your submarine. You will need to use missiles to combat them or find ways to evade their attacks. Sometimes, you may even need to unlock special missiles to target specific marine creatures.

Secondly, you will encounter various obstacles and impediments. The deep sea is filled with rocks, mines, and other obstacles that may block your path and cause damage. You will need to use missiles or other explosive items to clear the obstacles and continue moving forward. At the same time, you must be careful to avoid potential explosive obstacles to prevent serious damage to the submarine.

Most importantly, you will face attacks from enemy fleets. These enemies will deploy various types of warships and submarines to attack you. You will need to use different missile attack methods, choose the right attack strategy, such as torpedoes or missile launches. Additionally, you can switch and strengthen the submarine to increase its speed, weapon power, and defense capabilities to better deal with enemy fleets.

In the game, you will experience the dangers, mysteries, and thrills of the deep sea, formulate tactical plans, and bravely move forward in the deep sea.