In spite of all this, his friends stick by him come what may. Haddock invited him to stay at Marlinspike Hall after Calculus discovered it is the captain's ancestral home and bought it in his name thanks to money he had earned through selling the patent for his shark-submarine. He did this because Haddock and Tintin had provided him with the opportunity to test the submersible when they were searching for Red Rackham's Treasure. Tintin and Haddock crossed the world on at least two occasions (Prisoners of the Sun and The Calculus Affair) in order to save him from kidnappers.