The Swan Boats were powered by natural gas engines, and were originally designed to run with an electric guidance system. That system failed early in the attraction's life span and gave way to a new steering mechanism: two jets of water below the hull (one in front, one in back) that could swivel 360 degrees and thereby propel the boat in any direction, even in circles. Each jet was controlled by a separate steering wheel on a console at the rear of the boat. Accounts of the boats running into the concrete shoreline, pylons and other obstacles are common. The thought of these delicate-looking craft spinning out of control and crashing into things seems incongruous, but it also seems pretty funny.