Japan Decides to Wall Off Its Coast After the Tōhoku Tsunami
CONFIRMED75% CONFIDENCEThe seawall program has no single completion date and remains partly unfinished as of 2026, so this pin is dated to the 11 March 2011 Tōhoku tsunami — the confirmed, exact date of the disaster that led Japan to commit to building it (construction of the network itself began in 2012, per contemporary sources).[1]
Weeks after a tsunami kills nearly 20,000 people, Japan commits to a chain of concrete seawalls along 400 km of the Tōhoku coast — a decision that is still dividing the fishing towns behind it.
$8.2B
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