Inspection of unit 2 torus April 18. Source: TEPCORobot Searching for Leaks in Unit 2 Torus Returns Empty-Handed
[link to nuclearstreet.com]

[snip]

TEPCO sent a robot to inspect hatches on the wetwell of unit 2 for leaks Wednesday, but none were found in the two locations filmed. Leaks suspected to be in the torus have sent the 200 metric tons of water pumped daily over the reactor core flowing into the plant’s lower floors. The Asahi reported TEPCO had assumed the hatchways were the source of the leaks. The company is planning a similar survey for unit 3

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Hmmm.... 200 metric tons of water daily? Not the hatches?

Maybe it's holes in the bottom of the vessel? Made by a meltdown, maybe?

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