That's the bottom of the chamber 34 incline, it's about 20 minutes from daylight if you're not carrying anything and not hanging around. Easiest route would be down the back vein incline and along Lefel Ffrench - avoids any steps, ladders etc.
The area dewatered about 5 years ago and was quite well explored and photographed so wouldn't be new.
Easier - and to the best of my knowledge never dived (I think somebody intended to once but didn't) would be the E to G incline just off the back vein incline.
my orders are to sit here and watch the world go by