Guanyin, precisely as the sutra promised, was known to be especially adept at rescuing the drowning.  In the midst of a river battle a fat man meditated on the bodhisattva and abandoned ship.  The water was deep and the river was raging, yet the water came up only to his waist, as if he were standing in shallow water.  Eventually a boat came to rescue him, but the man’s weight was so great that he could not be lifted aboard.  The man looked down and saw four men pushing him up.  Once he was on the ship he looked back, but no one was there. 

The Story of Buddhism p. 80 paragraph 3

Matthew 14:22-36