Berean Study Bible
through which the world of that time perished in the flood.

King James Bible
Whereby the world that then was, being overflowed with water, perished:

American Standard Version
by which means the world that then was, being overflowed with water, perished:

Darby Bible Translation
through which [waters] the then world, deluged with water, perished.

Douay-Rheims Bible
Whereby the world that then was, being overflowed with water, perished.

English Revised Version
by which means the world that then was, being overflowed with water, perished:

Young's Literal Translation
through which the then world, by water having been deluged, was destroyed;