Fire engines connected their hoses to the city 's seawater - based Auxiliary Water Supply System ( AWSS ) .
Fire engines began to quench the fire , but an explosion caused the structure to collapse onto the fire hydrant .
Fire engines connected their hoses to the city 's seawater - based Auxiliary Water Supply System ( AWSS ) and began to quench the fire , but an explosion caused the structure to collapse onto the fire hydrant .