Guo Chuan planned to sail about 7,000 nautical miles to Shanghai and expected to complete the trip within 20 days.

Chinese mariner Guo Chuan sets sail of his trimaran in San Francisco, US on Oct 18, 2016, aiming to set a new solo non-stop trans-Pacific sailing world record from San Francisco to Shanghai.(Photo/Xinhua)

"This is a great challenge, but it's more exciting for me, the trans-Pacific, which means from San Francisco to Shanghai," said Guo Chuan, Chinese sailor.

To avoid the dangerous weather conditions, frequently occurring in the Pacific from May to October, Guo chose the 19th day of October as his starting day.

Although he expected sea winds and waves to take him off course, the veteran sailor felt he could find ways to overcome this problem.

Guo said, "I am currently sailing before the wind and southwards. Later I will manage to navigate westward as planned. Everything is going well and for the next several days I shall continue sailing westward."

But underneath this man's teak-tough exterior is a soft center. Before departure, Guo turned his son's laughter into music. Hearing his baby brings him so much joy on board.

This is not the first time the legendary captain challenged humanity's extremities.In 2012, he became the first Chinese person to sail non-stop around the world. And last year, he became the first man to sail through the Arctic Ocean's Northeast passage.

This time, the 51-year-old sailor chose an even tougher task, but he hasn't been seen since Tuesday after his vessel strayed off course.

But, the sailor once said "I have felt fear, desperation and I crashed once, but I will never be broken down."

File Photo taken on Oct. 18, 2016 shows Chinese mariner Guo Chuan sailing his trimaran under San Francisco's Golden Gate Bridge, the United States. (Photo/Xinhua)