Here’s an example: A diesel engine manufacturer put engines in a ship being newly built. When the engines are test fired, a cylinder head blows through the engine case and the ensuing fire destroys the ship. The engine manufacturer presents the claim to their Ship Repairers Legal Liability insurer. Ship Repairers Legal Liability coverage provides protection against property damage to vessels in their care, custody and control for the purpose of being repaired. The claim, however, is rightfully declined. Why? According to maritime law, a ship is not a ship until it has launched and put to its intended use (which usually means it has been delivered to the owner). In this instance, this ship was being built and had yet to be delivered, or put to its intended use. Therefore, it was not covered by the Ship Repairers Legal Liability policy.
Un article savoureux sur l'assurance "Corps", à lire en entier sur http://xlgroup.com/fast-fast-forward/articles/when-a-ship-is-not-a-ship