Hast thou entered into the springs of the sea? - The word here rendered “springs” (נבך nêbek), occurs nowhere else in the Scriptures. It is rendered by the Vulgate “profunda,” the deep parts; and by the Septuagint πηγὴν pēgēn - “fountains.” The reference seems to be to the deep fountains at the bottom of the sea, which were supposed to supply it with water. A large portion of the water of the ocean is indeed conveyed to it by rivers and streams that run on the surface of the earth. But it is known, also, that there are fountains at the bottom of the ocean, and in some places the amount of water that flows from them is so great, that its action is perceptible at the surface. One such fountain exists in the Atlantic ocean near the coast of Florida.
Or hast thou walked in the search of the depth? - Or, rather, in the deep places or caverns of the ocean. The word rendered “search” here (חקר chêqer), means “searching,” investigation, and then an object that is to be searched out, and hence, that which is obscure, remote, hidden. Then it may be applied to the deep caverns of the ocean, or the bottom of the sea. This is to man unsearchable. No line has been found long enough to fathom the ocean, and of course what is there is unknown. It is adduced, therefore, with great propriety as a proof of the wisdom of God, that he could look on the deep caverns of the ocean, and was able to search out all that was there. A sentiment similar to this occurs in Homer, when speaking of Atlas:
Ὅατε θαλάσσης;
Πάσης βένθεα οἷδεν.
Hoate thalassēs;
Pasēs benthea oiden.
Odyssey Job 1:5.
“Who knows the depths of every sea.”