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The 60-meter submersible deep-sea driller indecently developed by China completed its first trial run 3,109 meters below sea level in the South China Sea recently, which marks China's deep-sea drilling technology is ranked among world's top class, according to People's Daily reports on June 22.

The rig named "Sea Bull" was developed by Hunan University of Science and Technology.

The six-meter tall Sea Bull weighs 8.3 tons and has a circumference of 10 meters. It has gone through rigorous compression tests to see if it can withstand water pressure at a depth of more than 3,000 meters.

Visual remote control can be used to operate the rig.