Highwater Trousers' activation code is a holotape in Fallout 3.
Location
It can be found on the ghoul scientist in SatCom Array NW-05a and can be used to activate the Highwater-Trousers defense program.
Transcript
X948KJ
L4IERU
ER32J7
Notes
The ghoul scientist also carries the two SatCom array coordinates holodisks.
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