The hull was also stiffened by two deep suspension trusses or "hog frames," the top chord of which was  wide by  deep. There were three watertight bulkheads, which reach to the main deck.
The vessel's hull was strengthened by two large, deep suspension trusses known as "hog frames." The top chords of these trusses were wide and deep.  Three watertight compartments ran from the bottom to the main deck.