Survive in the Deep Sea! Fortunately, I Have a Reminder System

This can be considered a decent national survival novel. Ocean Survival started with a small fishing boat and was upgraded bit by bit, and gradually turned into a mobile fortress on the sea. PS The protagonist must be a popular type. If he is not a virgin, he is not a big villain. He is egoistic. Ps: This book should be considered science fiction or a game in general, not just hard science fiction... There may be some shady and supernatural things in the back, such as the old gods and magic. My setting is that the old gods are considered advanced civilizations, void creatures, and aliens? Magic... Can be regarded as spiritual civilization. Well... Maybe it's not science fiction in the strict sense. Writing a book for the first time may be a bit verbose. Hope everyone can understand. A new author doesn't know how to write an introduction, so this is it. I hope you all like it. I have been reading books for more than ten years and this is my first time writing a novel. Please forgive me if the writing is not good. Please give me your feedback if there are any shortcomings.