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In the case where the Responsible Party for a sunken vessel is unknown, involving the Coast Guard and the U.S. Army Corps of Engineers (USACE) is the appropriate course of action. This is because both agencies have established roles and responsibilities in managing marine incidents and can provide the necessary expertise in assessing the situation. The Coast Guard is tasked with ensuring navigational safety and environmental protection, while the USACE manages navigable waters and waterways, including issues related to sunken vessels.

By involving these authorities, a coordinated response can be ensured, which is critical for managing the situation effectively. They have the resources and authority to investigate the incident, determine the necessary actions to mitigate any environmental impact, and ultimately ascertain responsibility or take appropriate measures for vessel removal.

Engaging the local police or environmental agency may not provide the specialized support required for maritime incidents, and leaving the vessel undisturbed could create further hazards or environmental risks. Hence, the involvement of the Coast Guard and USACE is the most comprehensive and responsible approach.