"We're likely to see a dramatic increase now in drownings and other kinds of water fatalities and other kinds of danger associated with crossing in the water, " he said.
When the discussion shifts from identity theft and stolen bank account numbers to chemicals in the water supply, the danger becomes much more palpable.
Radiation readings on Thursday showed levels inwaterin Tokyo had fallen back below the danger level, but the municipal authorities are distributing thousands of bottles of water to households with infants.
Bishop Welby is a regular Twitter user and has already confirmed he will continue tweeting in his new role - despite the danger of getting into what he called "deep water".