5:30
Of these the third , about 10 , was by far the worst for violence and for the widespread devastation which it produced . At each of these explosions a tremendous sea-wave was created by the volcano , which swept like a watery ring from Krakatoa as a centre to the surrounding shores . It was at the second of these explosions -- that of 6:44 -- that the fall of the mighty cliff took place which was seen by the hermit and his friends as they fled from the island , and , on the crest of the resulting wave , were carried along they scarce knew whither . As the previous wave -- that of 5:30 -- had given the brig a tremendous heave upwards , the captain , on hearing the second , ran down below for a moment to tell Kathleen there would soon be another wave , but that she need fear no danger . `` The brig is deep and has a good hold o ' the water , '' he said , `` so the wave is sure to slip under her without damage . I wish I could hope it would do as little damage when it reaches the shore . '' As he spoke a strange and violent crash was heard overhead , quite different from volcanic explosions , like the falling of some heavy body on the deck .