HONOLULU — The Hawaii Superferry made its final interisland voyage last week, capping a period marked by lawsuits, low ridership and suspicion that its ultimate purpose had more to do with military contracts than with connecting the Hawaiian islands.

On Monday, the State Supreme Court effectively grounded the vessel, the Alakai, when it struck down an act passed by the Legislature last year that exempted its operator, Hawaii Superferry Inc., from carrying out an environmental impact study. The company said it would not appeal the decision.

“We’re going to have to go out and find other employment for Alakai,” said the president of Hawaii Superferry, Thomas B. Fargo, a retired Navy admiral who once commanded American forces in the Pacific. “Certainly the military may very well want to lease this particular ship.”

The Marine Corps already leases a similar transport catamaran, the Westpac Express, in Okinawa, Japan.

A shipbuilding analyst in Florida, Tim Colton, said the company’s owner and chairman, John F. Lehman, a former Navy secretary, was well positioned to lease the Alakai and a just-finished sister ship to the Navy.
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Why the company chose to risk operating without an environmental review, which would have taken the better part of a year, has been the matter of debate across the state, with Mr. Lehman’s background leading to speculation that Hawaii Superferry was primarily hoping to prove itself to the United States military.
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In November, Austal USA was awarded a contract to build up to 10 military versions of the ferry.

Austal’s Australian unit had built scores of giant aluminum catamarans used as fast ferries around the world, but the United States requires that all ships sold to its armed forces must be domestically built.

Austal USA, with a shipyard in Mobile, Ala., was created in 2001. “They have managed to become a major player in a very short time,” said Robert Button, a naval analyst with the RAND Corporation.

Austal USA’s vice president for external affairs, Bill Pfister, said that while the company had built several smaller ships in Mobile, the construction of the two Hawaii ferries had helped it develop the work force and demonstrate the construction processes to bid credibly for a similar military version.