To successfully eliminate Rico Delgado in the Santa Fortuna mission “The Three-Headed Serpent” in Hitman 2 using the submarine accident method, you can follow these detailed steps:

Step-by-Step Guide to Trigger the Submarine Accident

1. Locate the Injured Engineer:
– Head towards the slums area opposite the bar in Santa Fortuna. Here, you will find the injured engineer resting inside his house. However, be careful, as there is an enforcer guarding the entrance.
– To access the engineer, scale up to the back balcony of his house. From there, you can knock him out without alerting the enforcer at the front door.
– Once incapacitated, take his engineer disguise to ensure you can move freely among the other engineers.

2. Obtain the Key to the Basement:
– After donning the engineer disguise, follow the enforcer who will lead you to the bar. As part of your cover, he will provide you with a key to the basement door located beneath the bar.
– Equip the key, as you will need it to access the next area.

3. Enter the Submarine Construction Area:
– Use the key to enter the basement below the bar. Once inside, you’ll find another door that leads to a secret cave where the submarine is under construction. Navigate through this area carefully.

4. Sabotage the Submarine:
– As you explore the submarine construction area, look for a screwdriver. This is essential for your sabotage efforts.
– Once you have it, proceed to the submarine and remove the limiter. This action disables a critical safety mechanism, which will lead to an uncontrollable situation for the submarine later on.

5. Wait for Rico Delgado’s Arrival:
– After sabotaging the submarine, you will need to wait for Rico Delgado to make his entrance. He will eventually arrive and instruct you to rev up the submarine’s engine.
– Follow his instruction to start the engine. Doing so will trigger the submarine to detach and collide with him, resulting in his accidental death.

6. Make Your Escape:
– Since the sabotage will likely raise suspicion among the other engineers present, it’s crucial to make a swift exit from the area after the accident occurs.
– Utilize your knowledge of the surroundings and any available escape routes to evade capture and complete your mission.

Additional Information:
– This method is part of the mission story titled “Submerged” and also contributes to completing the assassination challenge known as “Splash Landing.”
– Engaging in stealth and planning is essential to avoid detection and successfully execute this plan.

By meticulously following these steps, you will achieve the objective of eliminating Rico Delgado through a cleverly orchestrated submarine accident while maintaining your cover as an engineer in Hitman 2.