It's pretty obvious by now that there's no real-world hack for diving into a literal room-full of gold coins (thanks, one thousand blogs on the internet for handling this already).
But have you seen this guy? Look at how he moves through it all nimbly-bimbly!
Not a scratch on him! No resistance from the cold, hard, metal death pit at all!! It's preposterous, even for a fantasy setting!
Or is it...
So maybe he's a level 18 Psi Warrior with the ability to cast Telekinesis at will, moving coins aside as he paddles, making room for each stroke?
Similarly, a skilled enough caster may be able to use Animate Objects to achieve the same goal...
Or perhaps old uncle Scrooge is a war domain cleric with an intense strength stat who casts Stoneskin to give himself the strength and density(?) to cut through piles of gold coin like a hot cleric through butter!
Ok, I can see this is beginning to get ridiculous...
Then again, there's always the school of Illusion! A grand enough spell could have convinced all of us, watching Saturday morning cartoons with our fruity loops and little brothers, that what was originally water was now glittering, glorious gold!
I'm sure there are more 5E-friendly explanations where those came from, so we'll give Scrooge a pass on his coinage clowning ... for now.
