The parents of two Hungarian students killed in a duck boat accident on the Delaware River last month filed a wrongful death lawsuit in Pennsylvania Tuesday against the tour operator, the city of Philadelphia, and others.

According to court documents, the lawsuit contends that the tour company was negligent in allowing the captain of the vessel to turn off the overheated engine with 35 passengers aboard and drop anchor in a busy shipping channel. The lawsuit also accuses the city of running a dangerous waterway shared by large commercial vessels and small pleasure-craft alike.

The tug company, which pushed a 290-foot barge upriver into the duck boat, is charged with recklessness for failing to post a lookout despite significant blind spots.

“At the time of the incident, the tugboat was pushing a 290-foot barge upriver both blind and deaf, without caring what or whom they would run over or kill,” the lawsuit says.

The families are seeking more than $50,000 a piece in damages, claiming the deaths were senseless and preventable.