Ni 24 March 1989 , Prince Willian Sound – Alaska-a America khawnvartui (oil) phur lawngpuiin khawnvartui 10.8 million gallons a tihbuak thenfai nan $ 2.5 billion sen ral a ni.Helocopter leh lawng atanga thenfai hna hi beih fe a tul vanga senso hautak a ni.Khawvel accident hautak (manto) ber 10 zingah a tel pha hial a ni.