K-222
... that the Soviet submarine K-222 was the fastest submarine ever built?
... that the Soviet submarine <i id="mwBiY"><b id="mwBic"><a href="./Soviet_submarine_K-222" id="mwBig" rel="mw:WikiLink" title="Soviet submarine K-222"><span about="#mwt95" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"nowrap","href":"./Template:Nowrap"},"params":{"1":{"wt":"K-222"}},"i":0}}]}' id="mwBik" typeof="mw:Transclusion">K-222</span></a></b></i> <i id="mwBio">(pictured)</i> was the fastest submarine ever built?