Nature Unleashed: Earthquake

Josh, a respected engineer, travels to Russia to inspect a nuclear power plant. Coincidentally, his ex-wife Rachel works at the facility and lives nearby with their kids. When Josh arrives at the plant, he leads a group of engineers down to the reactor's core to investigate a possible leak when disaster strikes; a catastrophic earthquake of an 8.2 magnitude rocks the Russian countryside.
At the same time, Josh and Rachel's daughter becomes trapped in a crumbled subway tunnel, while back at the plant several fires threaten to cause a meltdown - and an explosion ten times the size of Hiroshima...
So begins a race against time as Josh and Rachel fight their way into the collapsed train tunnels and nature reveals a final, deadly surprise...another MASSIVE QUAKE! (official distributor synopsis)