Your Lord is the One Who drives the ships for you in the sea so that you may seek of His bounty. He is Compassionate towards you.
Translation endnotes
[17:66] Water, with its unique chemical and physical properties, is crucial for life. For instance, the maximum density of water being at +4 Celsius degrees, in other words, its expansion in solid form, prevents oceans from freezing from the bottom up. Thus, oceans, with their diverse organisms, function as giant livers cleaning the air in the atmosphere.