Long also suspected that "Titanic"s breakup may have begun with the premature failure of the ship's after expansion joint, and ultimately exacerbated the loss of life by causing "Titanic" to sink faster than anticipated. In 2006, the History Channel sponsored dives on "Titanic"s younger sister ship, , which verified that the design of "Britannic"s expansion joints was superior to that incorporated in the "Titanic". To further explore Long's theory, the History Channel commissioned a new computer simulation by JMS Engineering. The simulation, whose results were featured in the 2007 documentary "Titanic's Achilles Heel", partially refuted Long's suspicions by demonstrating that "Titanic"s expansion joints were strong enough to deal with any and all stresses the ship could reasonably be expected to encounter in service and, during the sinking, actually outperformed their design specifications. But, most important is that the expansion joints were part of the superstructure, which was situated above the strength deck (B-deck) and therefore above the top of the structural hull girder. Thus, the expansion joints had no meaning for the support of the hull. They played no role in the breaking of the hull. They simply opened up and parted as the hull flexed or broke beneath them.