I did the math:
There’s an estimated 2,781 billionaires on the planet. If they are an average of six feet tall (generous) the stack of them would span 16,686 feet of the Mariana Trench’s 35,814 feet. Leaving 19,128 feet, or room for about 3,188 millionaires.
But everyone is forgetting the chain and cinder blocks they take up room too. Lets face it those Billionaires and Millionaires won't go to the bottom willingly.
If the average billionaire has $2 billion, and there were 2781 billionaires:
That's 2x2781 billion dollars ÷ by $100 bills, ÷ 0.0043in (US bill thickness) ÷ 12 in ÷ 5280 ft = .. if 2781 billionaires stacked their net worth in $100 bills it would be 3775 *miles* high. Comm satellites orbit at 250mi