Unsinkable Ships Can you construct an unsinkable sailing boat from cardboard to transport cargo across the sea? #CardboardNinja Deliver the Payload Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *CommentName* Email* Website Save my name, email, and site URL in my browser for next time I post a comment. Notify me of follow-up comments by email. Notify me of new posts by email.