They noted that the floor of the Challenger Deep consisted of " diatomaceous ooze ".
2.
On their 1960 descent, the crew of the " Trieste " noted that the floor consisted of diatomaceous ooze and reported observing " some type of flatfish " lying on the seabed.
3.
The crew of the " Trieste " noted that the floor consisted of diatomaceous ooze and reported observing " some type of flatfish, resembling a sole, about 1 foot long and 6 inches across " lying on the seabed.