Filmed on a fellow passenger’s mobile phone, the man is seen standing next to a woman who is asleep in a seat.
The video – believed to have been filmed in China – captures the man as he inches closer to the woman, resting his hand against her breast.
At one point in the shocking clip, the man stretches out his fingers to brush over her boobs.
The woman is unaware of the sexual assault, as she continues to lay fast asleep.
Viewers were outraged by the man’s brazen act.
Others were angered by the lack of people stepping in to stop the groper.