After Jesus died, he went to the place of the Dead. 1 Peter 8:19-20

19 After being made alive, he went and made proclamation to the imprisoned spirits— 20 to those who were disobedient long ago when God waited patiently in the days of Noah while the ark was being built. In it only a few people, eight in all, were saved through water,

If possible, I'd like an answer covering the following aspects:

  1. What is this place ?
  2. Is it Sheol/Hades?
  3. Does it still exist now?

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