Following are a number of back-translations as well as a sample translation for translators of Jeremiah 51:53:

• Kupsabiny: “Even if Babylon wanted to climb to the top,
  or make the wall wide and build it upwards,
  I will send to them enemies to destroy (them) completely!’” (Source: Kupsabiny Back Translation)
• Hiligaynon: “Even though the walls of Babilonia reach to the atmosphere/sky/air-space, and even if she would strengthen it, I will- still -send her destroyers. I, the LORD, (am) the-(one) saying this.” (Source: Hiligaynon Back Translation)