One of the four Indian students who drowned on entering a fast-flowing river near St Petersburg in Russia was on video call with his father sitting in India, who saw the entire tragedy unfold in front of his eyes. The four medical students of Yaroslav-the-Wise Novgorod State University in Veliky Novgorod city near St Petersburg drowned when they stepped into the Volkhov river while taking a stroll, university authorities said on Friday.