Using OOP to represent things related to sailing...

Program.cs

public class Vessel {
    List<SeaFarer> SeaFarers; // this is private automatically to help promote data abstraction 
                             // (data shouldn't be assessed publicly, 
                             // instead use GetSeaFearer() in this class )

    public Vessel() { // this is constructor
        this.SeaFarers = new List<SeaFarers>(); // initializes the seaferes in constructor
    }

    public Vessel(List<SeaFarer> seaFarer) { //this is constructor overloading
        this.SeaFarers = seaFarer; // initializes the vessel with given data (this is called dependecy injection)
    }
    
    public List<SeaFarer> GetSeaFearers() {
        return this.SeaFarers;
    }
}

class SeaFarer {
    // add properties of a seafarer here
    //e.g.
    string FirstName { get; set; }
    string LastName { get; set; }
    Rank Rank { get; set; } // is of type 'Rank` ===> take a look at the rank enum below 
                            // (this is better than hardcording string to know which 
                            // level a seafarer is)
}

enum Rank {
    LevelOneOfficer,
    LevelTwoOfficer,
    SeniorOfficer
}