Local rescue teams reached the scene promptly, but the lack of adequate medical equipment and medicines at the nearby island hampered efforts to save more victims.NEW DELHI: An Indian survivor of the tourist boat tragedy off Vietnam's Phu Quoc Island has described how a "sudden storm" overturned the vessel within seconds, trapping passengers inside and leaving 15 Indian tourists dead. Speaking after the accident, Nirmal Kumar said rescue teams responded quickly but claimed inadequate medical facilities and supplies on the nearby island may have cost additional lives. Vietnamese authorities are investigating the cause of the accident.Nirmal Kumar, one of the survivors, said the speedboat carrying 36 people, including 32 Indian tourists, was travelling between islands when rough weather stru