Abraham Louhenapessy, commonly known as "Captain Bram", is on trial on remote eastern island of Rote for allegedly buying a boat and helping find a crew for a voyage intended to take 65 migrants to New Zealand in early 2015.
Louhenapessy is allegedly a notorious figure in the illicit trade that involves sending boatloads of migrants from Indonesia, a staging post on long-established people-smuggling routes, typically to Australia.
"In the trial proceedings, no excuse was found to pardon or justify the defendant, and therefore he must take responsibility for what he has done in accordance with the law," prosecutor Alexander Sele told the Rote court.
Louhenapessy's defence is due to begin next week and the court will then give its verdict and hand down a sentence.
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The prosecutor said that Louhenapessy had received payment of 1.5 billion rupiah (USD 112,000) for his role in the smuggling scheme.
The crew claimed they were paid about $30,000 to turn back, angering Indonesian officials who worried that it could encourage an increase in people-smuggling attempts. Australia refused to comment on the claims.
The captain and crew from the boat were caught and jailed in Indonesia in January last year after being found guilty on people-smuggling charges.
Australia turns migrant boats back to Indonesia when it is safe to do so. The tough policy was introduced to stem the flow of migrants arriving on the country's shores, but it has long angered Indonesian officials.