Sir, he may live:
I saw him beat the surges under him,
And ride upon their backs; he trod the water,
Whose enmity he flung aside, and breasted
The surge most swoll’n that met him; his bold head
‘Bove the contentious waves he kept, and oared
Himself with his good arms in lusty stroke
To the shore, that o’er his wave-worn basis bowed,
As stooping to relieve him: I not doubt
He came alive to land.
– William Shakespeare
The Tempest, Act 2, Scene 1. Francisco tells Alonso that he saw his son Ferdinand swim strongly over the waves, keeping his head above them, heading towards the shore. He has no doubt that he got ashore alive.