In a moment of absolute despair, as a man is thrown into a raging sea to die, a miraculous turn of events unfolds. Instead of drowning in the ocean depths, the water becomes a temporary refuge. The forces of nature are mobilized to preserve the life of a person fleeing his destiny.
The primary approach among commentators is that God orchestrated the arrival of a large fish, preparing it to be at the exact location where Jonah was cast overboard. This ensured he was swallowed immediately, saving him from a swift death in the water [מצודת דוד, מצודת ציון, רד״ק, אבן עזרא, ביאור שטיינזלץ]. Going even further, some explain that the appearance of this creature was not a random coincidence, but rather a specific mission prepared for it since the six days of creation [רד״ק, צאינה וראינה].
Surviving inside the creature was an immense miracle that completely defied the laws of nature. Jonah was swallowed whole without a single bone being broken. Naturally, a human being cannot survive inside an animal's stomach for even a brief period without drawing fresh air [אבן עזרא, אברבנאל, מלבי״ם]. To understand this supernatural preservation, some compare his condition to an unborn child resting within its mother, sustained for months without breathing outside air, or to the miraculous survival of Hananiah, Mishael, and Azariah in the fiery furnace. Despite the impossible environment, Jonah maintained full consciousness and mental clarity, retaining the ability to pray [אברבנאל, מלבי״ם]. Expanding on the nature of this miracle, a Midrashic approach describes that the creature's mouth was filled with light, and a precious stone rested inside, illuminating the darkness and allowing Jonah to observe the hidden wonders of the ocean depths [צאינה וראינה].
Jonah remained inside the fish for three days and three nights, a duration that raises the question of why he did not cry out in prayer the moment he was swallowed. Some explain that the initial creature was a male with a spacious interior. Because Jonah found himself in a state of relative comfort, he did not feel the immediate urge to pray to God. To stir his heart toward prayer, God commanded the first creature to expel Jonah into the mouth of a female fish carrying thousands of unborn offspring. Only upon being forced into this tight, severely crowded space, overwhelmed by pressure and suffering, did Jonah break his silence and begin to cry out to God [רש״י, צאינה וראינה].