Revamping

And He said to him, Go, wash in the Pool of Siloam—which means Sent. So, he went and washed, and came back seeing. (John 9:7)

The Pool of Siloam was built during the reign of Hezekiah (715–687/6 BCE), to leave besieging armies without access to the spring’s waters. The pool was fed by the newly constructed Siloam tunnel. Hezekiah sealed up the old outlet of the Gihon Spring and built the new underground Siloam tunnel in place of the older tunnel (Books of Chronicles, 2 Chronicles 32:2–4).

The pool was reconstructed no earlier than the reign of Alexander Jannaeus (103–76 BCE). 

The pool remained in use during the time of Jesus. As a freshwater reservoir, the pool would have been a major gathering place for ancient Jews making religious pilgrimages to the city. Some scholars, influenced by Jesus commanding the blind man to wash in the pool, suggest that it was probably used as a mikvah (ritual bath).

The pool was destroyed and covered after the First Jewish–Roman War in the year 70 CE. 

And He said to him, Go, wash in the Pool of Siloam—which means Sent. So, he went and washed, and came back seeing. (John 9:7, AMP)

Doubters used this verse to disbelieve the Bible. AND THEN! Lo and behold, it was rediscovered.

What are you using as your big doubt? Get over it, friend. The Bible was truth. The Bible is truth and the Bible will always be truth. It is the Word of God. Your puny opinions cannot stand against its truth.