Previously, __________ operated vehicles have visited the depths of the Antarctic Ocean with initial findings suggesting that an abundance of life can be found in the icy depths, rivaling even tropical coral reefs

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Previously, __________ operated vehicles have visited the depths of the Antarctic Ocean with initial findings suggesting that an abundance of life can be found in the icy depths, rivaling even tropical coral reefs. This expedition certainly did not disappoint.

1. extractedly
2. casually
3. remotely
4. distantly