On the RATP as a whole, 1 in 4 trains are running, but on the B line (which I would take to work), nul. So another day at home. Line B is also the one that goes to CDG airport. A good day to be a taxi driver.

One metro line that's functioning at 100% despite the strike is line 14. It's entirely computer operated. Unfortunately it doesn't go very near Cachan - I'd guess about a 2 hour walk from the final station at olympiades.