How do you exterminate the sea monster in the S-Rank Mission mode?

To exterminate the sea monster in S-Rank Mission mode, you typically need to gather specific resources and gear tailored for aquatic combat. Focus on utilizing powerful ranged weapons or traps that can exploit the monster's weaknesses. Coordination with teammates is crucial, as you should strategize to distract or immobilize the monster while dealing damage. Always keep an eye on your health and position to avoid its devastating attacks.