John Donne has created Metaphysical Conceit - an extended metaphor two very unlike things.
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Capulet is a character of the famous literary piece of William Shakespeare, Romeo and Juliet. Capulet went impulsive in hurrying Juliet's wedding day with Count Paris. However, since Juliet is reluctant, Juliet devised a strategy to fake her own death, This annoyed Capulet.
The direct object in the sentence is passengers.
Direct Object follows a transitive verb and answers to the question who or what. It can be a noun, pronoun, phrases, or clauses.
Subject = sailors
Transitive verb = rescued
sailors rescued who? - passengers - direct object.