Tenebrus really is one 'difficult and half' spider to see. Very opaque webbing, her own dark colouring, and the partially subterranean nature of this spider makes video of her very very hard to get. So here is some, but its rather brief.

Here, she is simply having a brief foray into her tank at large, but soon pops back underground, and that's the last I see of her for a while. For those thinking the tank is too small. Yes, you are right, but she is nearing a moult, and I'll transfer her to a new one as soon as she is past that. I am fully confident she has enough room to moult OK.