DANISH submarine inventor Peter Madsen, who was found guilty of the torture, sexual assault, murder and dismemberment of a Swedish reporter, has appeared before an appeals court to fight against his life sentence.

Madsen, 47, still denies murdering 30-year-old Kim Wall but has accepted the verdict in order to move on, according to his lawyer.

In Denmark, a typical life term is 16 years, but can be extended.

Madsen, who claims Wall died accidentally inside the submarine in August 2017, wants a time-limited sentence, not an open-ended term.

A verdict is expected on September 14.

Wall visited the submarine last year to interview Madsen, who co-founded a company that develops spacecraft.

Her remains were found in plastic bags on the sea bed weeks later.

Madsen has confessed to throwing her body parts into the Baltic Sea.