BALTIMORE (AP) — The owner and manager of the massive container ship that took down the Francis Scott Key Bridge last month should be held fully liable for the deadly collapse, according to court papers filed Monday on behalf of Baltimore’s mayor and city council.

The two companies filed a petition soon after the March 26 collapse asking a court to cap their liability under a pre-Civil War provision of an 1851 maritime law — a routine but important procedure for such cases. A federal court in Maryland will ultimately decide who’s responsible and how much they owe in what could become one of the most expensive maritime disasters in history.

Singapore-based Grace Ocean Private Ltd. owns the Dali, the vessel that veered off course and slammed into the bridge. Synergy Marine Pte Ltd., also based in Singapore, is the ship’s manager.

In their filing Monday, attorneys for the city accused them of negligence, arguing the companies should have realized the Dali was unfit for its voyage and manned the ship with a competent crew, among other issues.