Large cruise liners are regarded as one of the most challenging vessels to build because of their complexity and high standards. And after three years of construction, China's first homegrown cruise liner is scheduled for delivery in 2023. Our reporter Wu Bin follows an engineer busy working on its final stage before sailing.

This is Adora, China's first domestically-built cruise liner. Weighing over 130,000 tons, it's the largest passenger vessel that China ever built.

Now, it's sitting quietly in the northeast tip of Shanghai, and almost ready to sail.

WU BIN Shanghai "We are now on top of China's first domestically-built cruise liner, Adora. This spot will be perfect for sunbathing and chatting once the vessel begins operations. Enormous effort has gone into the construction of this ship. The liner has 25 million components, double the number needed to build an aircraft carrier."

Ma Ling is one of the few female engineers in China's shipbuilding industry.

She and her team are now working on the testing of the ship to make sure every function is running normally once sailing in the ocean.

But as someone who's been working in this industry for over 20 years, to make this ship "alive" is nothing like any previous vessels.

"There are about 30,000 safety points on the ship. You need to test them one by one, and do it three times."

MA LING Manager, Completion Management Office, Cruise Ship Project Shanghai Waigaoqiao Shipbuilding Co., Ltd., CSSC "In the past, we may only need 30 to 60 people to do the testing job, but for this ship, we still feel a bit short-handed even if we have 300 people."

What's making the testing job so difficult is not only the size, but also its high standards for both comfort and energy efficiency.

For example, the air-conditioning will automatically stop once you open the door to the balcony.

"The system assumes you need some wind breeze and then it stops the air-conditioning to make it green and energy-saving."

Now the ship is about to be delivered this year, and final preparations are in full swing. The factory has an average of 3,500 workers on the ship per day.

CHEN JIANWEI Assistant President, Shanghai Waigaoqiao Shipbuilding Co., Ltd., CSSC "At the beginning of June, the ship will leave the dock, which is a key stage. Then, we will conduct a mooring test for about one and a half months, mainly for a first trial run in mid or late July. And then there will be a second trial run afterwards."

For the entire team, the days during the trial run will be sleepless. But they all look forward to the day when Adora sails the oceans.

MA LING Manager, Completion Management Office, Cruise Ship Project Shanghai Waigaoqiao Shipbuilding Co., Ltd., CSSC "It is such a large ship. By the time it leaves the dock, sails on the Yangtze River, and finally goes out to the high seas, and if there are other ships passing by, it will be a very spectacular scene."

To all the workers who have been dedicated to the first cruise liner, the construction has provided a lot of experience, making the entire industry chain more complete. And now, China's second cruise liner is also on its way. Wu Bin, CGTN, Shanghai.