Hello!
The series "Blast from the past" is a timeline continuation of a mission pack of mine called "I sold my soul to the devil" that can be found in the storyline section of the DYOM website.
It is advised to first play through that mission pack first to have a better understanding of the story.

After Pedro gets lost at the sea he has to find his way back to Los Santos, but that not might be as easy as it sounds.