I’d also like to know what they’re saying. I imagine it’s some combination of expletives and confused speculation.

My russian is very basic, so take it with a grain of salt:

• in the beginning one woman is repeatedly demanding that the other woman (the driver) looks at the road (instead of the explosion I guess)
• After the shockwave the driver is asking if everybody is ok and if their windows are intact.
• At the end they are briefly discussing if it is save to continue following the road now or take another route.

I could not identify any expletives or speculation. In that moment they seem only concerned with their immediate safety.