China unveiled the design of its Mars probe on Tuesday, hours after announcing that one of its unmanned submersibles had dived to a depth of more than 10,000 meters under the sea.

The Mars probe will consist of three parts — the orbiter, the lander and the rover, according to design illustrations released by the China National Space Administration.

The rover will have six wheels and four solar panels.

The nation plans to send an unmanned probe to Mars to orbit and land on the planet around 2020, Liu Jizhong, deputy head of China's Mars exploration program, said at a ceremony to reveal the probe's design.

He said the Mars mission is on schedule, with Chinese scientists having completed their technological preparations and finalizing the probe's design.

"We have begun to produce the probe's subsystems. The mission will be accomplished in 2020 without delay," Liu said, adding that the favorable launch time for a Mars mission appears every 26 months, so there will be three such opportunities before the end of 2020.

While the nation has been looking at exploring the unknown universe, Chinese researchers have not been ignoring the oceans.

One of the country's unmanned submersibles dived to a depth of 10,767 meters, setting a national record, the Chinese Academy of Sciences said on Tuesday.

TheHaidou set the record at the Marianas Trench in the West Pacific, the deepest sea area in the world, during a scientific expedition from June 22 to Aug 12. During the trip, the submersible dived more than 8,000 meters below the sea surface once, 9,000 meters twice and 10,000 meters twice.

This makes China the third country after Japan and the United States to have built submersibles capable of reaching depths of more than 10,000 meters, the academy said.

Speaking about the Mars mission's difficulties and challenges, Zhang Rongqiao, the program's chief planner, said the farthest distance between the Earth and Mars is about 400 million km, so it will take the probe nearly seven months before it reaches the Martian atmosphere.

The orbiter will then release the lander and the rover and continue to orbit Mars to survey the planet. The lander will soft-land on the Martian surface and deploy the rover. The entire process will require good communications among each craft and between them and Earth, Zhang said.

Sun Zezhou, chief designer of the probe, said there will be many uncertainties during the landing process and the Martian surface will be more "sophisticated" than that of the moon.

The rover will weigh about 200kg, carry 13 scientific instruments and will work for 92 days on the planet, he said.

Sun said China will also send a probe to Mars around 2030 to take samples and return to Earth.

Since the 1960s, 43 probes have been sent to Mars, but only 22 accomplished their missions, according to the China National Space Administration. (China Daily)