The adverbial dependent clause is :who had never seen the ocean before.
An adverbial clause exists as a dependent clause that modifies the main verb in the independent clause. Adverbial clauses always begin with a subordinating conjunction and must combine with an independent clause to make sense.
An adverbial clause, also called an adverb clause, is a group of phrases that forms a structured clause and acts as an adverb in a sentence. Adverbial clauses contain a subject, a predicate, and a subordinating conjunction. As with different adverbs, adverbial clauses modify an adjective, a verb, or some other adverb.
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