Funny i was jsut reading a clive cussler novel that mentions this shipwreck. I think it is in the night probe novel Dirk Pitt series’ https://www.allfreenovel.com/Book/Details/43510/Night-Probe!-(Dirk-Pitt-6)
I remember that book, but I don’t remember the Roberts being in it. The RMS Empress of Ireland was a part of that one.