Surah 54. Al-Qamar, Ayah 14

I.e., "under Our protection". The reference to Noah's ark as "made of mere planks and nails" is meant to stress the frailty of this - as well as any other - human contrivance.

As usual, Allah's Mercy in saving His faithful servants takes precedence of His Wrath and Penality. And He helps and rewards those whom the world rejects and despises!