A quick question . Other than a suprisingly lot of complexity involved in diggin the hole of sufficient size and depth why wouldnt it work ( or is that the reason )?

Weight is a way to make the problem sound worse than it is, because nuclear waste is so incredibly dense. It’s not enough to be a big deal yet. Dumping it deep into the ocean is an option, but it’s only going to happen to waste that doesn’t have potential uses first.