Since the site only has scientific value because it has been sealed away for millennia, I'd have thought they'd take more care about preserving its microbial integrity and not just go diving in it.
Please look at the pictures in the last link - they show a probe about to be lowered into the borehole - that 3" pipe at the bottom of the pic. Nobody went diving unless they were blended first. Also, the site has value because it shows that animals needing high energy (to avoid the constant rain of gravel, dust, and boulders) can survive in such austere conditions. Look at how the sea bottom is totally dead - nothing stationary or slow can live there.