midnight
No one thought of sleep . The Abraham Lincoln , not being able to struggle with such velocity , had moderated its pace , and sailed at half speed . For its part , the narwhal , imitating the frigate , let the waves rock it at will , and seemed decided not to leave the scene of the struggle . Towards midnight , however , it disappeared , or , to use a more appropriate term , it `` died out '' like a large glow-worm . Had it fled ? One could only fear , not hope it . But at seven minutes to one o'clock in the morning a deafening whistling was heard , like that produced by a body of water rushing with great violence .