The divine decision to wipe out humanity now takes on a practical, clear dimension as God reveals to Noah the exact means of the world's destruction. Following the command to construct the Ark, the method of devastation and the Ark's specific role are clarified. God's direct involvement signals a swift and decisive action. The primary approach among commentators is that God is expressing agreement with the ministering angels, who originally questioned the creation of humanity and sought to prevent it. Now, stepping away from the attribute of mercy that previously advocated for the generation, God agrees with their claim and seals the judgment [רש״י, מזרחי, גור אריה]. However, others argue that God cannot be in full agreement with the angels' demand for total annihilation, as He is intentionally preserving a large remnant through Noah. Instead, this direct involvement emphasizes that God's hand will personally strike the generation because they corrupted the earth [רמב״ן]. This also serves as a stark contrast to Noah's role: while Noah is tasked with building the Ark, God alone will bring the disaster at the appointed time [ספורנו, קאסוטו]. Furthermore, this underscores that the impending catastrophe is not a mere climatic natural phenomenon, but an act of direct divine providence [מלבי״ם], ultimately allowing the destructive forces that humanity itself created to complete their work [אור החיים].
The nature of the flood represents a process of falling and corruption, akin to withering leaves, marking the fading and destruction of life forces [רד״ק, שד״ל, רש״ר הירש]. It also implies a chaotic mixing and confusing of the natural elements [רלב״ג, הכתב והקבלה], ultimately leading the world to its ruin [העמק דבר]. Integrating these concepts, the disaster is understood as an event that corrupted everything, confused the natural order, and swept all life away in a fierce, descending current [רש״י]. Because a catastrophic deluge from the sky could theoretically involve fire or hail, it is explicitly established that this devastation would be brought about by water [רד״ק, אבן עזרא]. The choice of water is highly deliberate. The generation sinned through arrogance born of the immense physical abundance God had granted them, particularly the abundant water from rivers and springs. Therefore, God judged them using the very element that fueled their rebellion [תורה תמימה]. This reflects a precise measure-for-measure punishment. The people sinned through robbery, constantly breaching the boundaries of their fellow man; in response, they were punished by water, an element where individual drops are meant to remain distinct but instead breached their natural boundaries to form a raging torrent. Furthermore, their sins of idolatry represented an abandonment of the source of living waters, and their sexual immorality warranted the punishments of choking and drowning [כלי יקר]. As the first global punishment in history, it was fittingly executed using the element closest to the earth [רס״ג].
The impending destruction is directed at all living creatures, indicating that the devastation is aimed solely at the physical, feeling body, rather than the eternal soul [רש״ר הירש]. According to the laws of nature, nothing is ever completely lost; the organic matter will not vanish entirely but will decompose into its base elements, remaining within the earthly realm even as its living form is destroyed [מלבי״ם]. Yet, the devastation is explicitly confined to life on the land, deliberately excluding the fish in the sea. Because marine life does not share the terrestrial environment with humanity, it remained uninfluenced by human corruption and was therefore spared from the decree [רד״ק, ביאור יש״ר]. Sparing the creatures of the sea also ensured a guarantee of continuity: had Noah sinned and the Ark been lost, God could have generated a new world from marine life without needing to create an entirely new existence from nothing [קונטרס חיבה יתירה]. For those upon the land, their demise would be sudden. This suggests a swift transformation of the living, feeling body into inanimate matter in a single instant, reflecting God's underlying mercy by sparing them from prolonged suffering [רש״ר הירש, ביאור יש״ר]. Conversely, others view this end as a complete dissolution and melting away of the physical flesh within the raging waters [העמק דבר].