His achievement also set the new record of the event, beating the old record of 8:13.41.
In the men’s 400m medley, the HCM City-born swimmer Nhat also triumphed with a time of 4:28.27.
In addition to two golds, Nhat brought home a silver medal in the 400m freestyle.
At the Southeast Asian Games, which concluded in Malaysia last month, Nhat won a silver medal in the men’s 1,500m freestyle.