Talking about the trip I did a few years ago:
I have been there and it was amazing. I had not seen a frozen sea until that time!
Did I use past perfect correctly or should I just say "I did not see .."? Also is the "until that time" ok?
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The verb forms are fine, but, depending on context, until then might be more usual than until that time.
The usage is correct, but I would consider trying
I had never seen a frozen sea before!