Gas
I do know what it is like to loose stuff.
Never a flood, but last year I lost my Colorado log home and all 17 acres to fire, nothing left to even fix up. Lost some fine firearms, and lots of antiques. Not to mention the ammo, stored in dry Colorado.
All my daggers and military stuff was here in Missouri, so still have it.
If the wood grip is really dry, try some clear wood preservative, it will soak into the wood, not just sit on top like wax. After it dries for several weeks, then wax.
I remember Andy all excited about the SOS so he could get those BBQ sandwiches, dang, he loved those.
I bring back WWII fighting knives from the grave, but your daggers should be left alone I guess. To each his own. Do what makes you happy.
Ed