The nuclear-powered Project 949A Antey submarine K-141 Kursk sank in an accident on 12 August 2000 in the Barents Sea. It was taking part in the first major Russian naval exercise in more than 10 years. All 118 personnel on board were killed. (Wiki)
A short moment in an interview with Larry King, for which Putin has been widely critized.
Kursk 2000 tragedy - Larry King questions Putin what happened.
Short Spiegel summary.
"Kursk"-Untergang: Eine russische Tragödie | SPIEGEL TV
The Kursk Submarine Disaster (2000) | Putin's first political challenge
В.Путин.Интервью ведущему CNN,Ларри Кингу. 08.09.00 Part 1