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Of course no, it cannot be Utumno. Utumno was much much bigger and deeper and valars destroyed it's upper levels completely. Even the Barad-dur would be a little tower compared to Utumno. In the series this dark stronghold is just a nameless lesser fortess of Morgoth, and seems smaller than Barad-dur.
Yes, but unreachable. According to canon valars didnt destroy the lower levels and many evil creature stayed there. These are symbolic places, Valinor represented the heaven, and Utumno was the Hell in Arda. Udûn/Utumno word means Hell. Both exist, but you cannot go there. Doesnt matter if you have a boat, you can't sail to Valinor, and ruins of Utumno located too deep to reach it.
Suppose you live in Third Age and you wanna go to Utumno. You wont know where is it exactly, but somewhere in north east. What are you gonna do? It's located 10 km deep or something like that. Will you dig the complete Forodwaith in such depth? Impossible. Okay suppose you have more knowledge than the wisest noldor and you know that dragons, Nameless Things are all originated from Utumno (although nobody knews this information in Third Age except Gandalf or Sauron) and according to this logic you are going to Grey Mountains or Moria to follow their tunnels in the deep. First of all you will meet with armies of orcs, troll and dragons. How can you beat them? Suppose you defeated them and you entered these tunnels in the roots of mountains. Obviously these tunnels are home of big worms and unknown creatures. Even the most powerful mage Gandalf was afraid of Nameless Things very much and he was maia. The question is same, how can you beat them? Impossible, and i remind you at such depths the food, potable water are very rare.
But okay suppose you are the greatest wisest luckiest person in Middle Earth and finally you reach the gates of Utumno and you enter it. After that you will face unimaginable horror and you will get a total mental collapse. These evil foes like fallen maiar, demons, fire spirits, ghosts, phantoms,various corrupted creatures, nameless things are more cruel than the most bestial serial killer. Only gods like Valars have any chance against them. You will burn and suffer forever, and there is no escape because this place is Hell of Arda.
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