Luqman 31:32 واذا غشيهم موج كالظلل دعوا الله مخلصين له الدين فلما نجاهم الى البر فمنهم مقتصد وما يجحد باياتنا الا كل ختار كفور ٣٢

Allah tells us that He is the One Who has subjugated the sea so that ships may sail on it by His command, i.e., by His grace and power

For if He did not give the water the strength to carry the ships, they would not sail. So He says:

(that He may show you of His signs)