At around 15:52 the operation was to P/U drill pipes using the power catwalk in order to prepare DP stands for the next section. The driller was on the brake and the mud tester was operating the power catwalk. The drill pipe joint was rolled from the pipe rack to the power catwalk using catwalk kicker. The mud tester did not notice that the drill pipe pin end rolled beyond the catwalk groove. Accordingly, when the power catwalk was raise up to around 2m, the drill pipe fell down. No-go zone was clear of people and nobody got hurt.