TEPCO did the second endoscopic examination of Reactor 2 Containment Vessel on March 26, 2012, and finally found water. It was 3 meters below where TEPCO had expected to find (which was at the grating), and only 60 centimeters deep from the bottom of the CV.
Mainichi Shinbun (3/26/2012) puts out this cartoon which well reflects what TEPCO said in the evening press conference on March 26:
Part of the corium is still inside the Reactor Pressure Vessel, and part of it is at the bottom of the Containment Vessel;
60 centimeters of water is sufficiently covering the corium at the CV bottom, and the corium is cooled;
The temperature of the water that's supposedly removing the heat is (incredibly) 48.5 to 50 degrees Celsius:
The Suppression Chamber is probably damaged and leaking the water being injected into the reactor (9 tonnes/hour).
This is strange, as TEPCO themselves admitted last year that part of the corium of Reactor 2 was on the concrete pedestal, outside the Containment Vessel. That would mean the Containment Vessel (drywell) itself had been breached, not just the Suppression Chamber.
You may ask "Why trust anything TEPCO says?" Well, TEPCO is still the only source of any information about the plant, no matter how flawed or inadequate.
TEPCO has some photographs of the water and inside the water. Water is clear, TEPCO says, but there is yellowish debris in the water.
TEPCO also measured the radiation levels inside the CV, according to the plan, but there is no information on the radiation levels.
It took about 3 hours for the work, 18 TEPCO employees and 16 Toshiba employees, with maximum radiation exposure of 5.29 millisieverts.
From TEPCO's Photos for Press:
Inside of Primary Containment Vessel of Unit 2 (above the water surface):
Inside of Primary Containment Vessel of Unit 2 (under the water surface):
Inside of Primary Containment Vessel of Unit 2 (pipe of power cable and grating):
Survey of Inside of Primary Containment Vessel of Unit 2 (working condition):
From TEPCO's Summary of Findings (3/26/2012):