The accident happened in the New Stage venue, one of four venues in the Bolshoi Theatre of Russia complex. The Main Stage venue had recently gone through significant architectural modifications, and it is suspected that Sedov entered the unlit sub-stage entry platform behind the orchestra lift and stepped out in the darkness to where he believed the Orchestra Lift Platform was positioned. In the old configuration of the facility the platform was at the same level as the bottom of the pit. The lift platform was up at a higher level and he plummeted into the machinery pit. One report says the fall was about 6 meters (19 feet), but this may be the total depth from the stage, and not the depth from the sub-stage entry platform, however, another news report says that he fell from the stage level. Part of the facility reconstruction involved the addition of many levels of subterranean storage and workspaces, so it may be that the Orchestra Lift pit did extend down 6 meters from the substage platform.
On Wednesday, the Bolshoi's press secretary, Katerina Novikova, said the cause of Sedov's death will be determined by a special commission. A decision regarding further legal action will be made depending on the outcome of the police inquiry into the incident.
- Inadequate illumination of the walking surfaces.
- Lack of guardrails to protect workers from falls.
- Lack of interlocks on doors leading to hazardous workspaces.
- Solo workers in unobserved workspaces.