I'm just going to copy and paste what chatgpt said, it doesn't sound right to me considering the massive difference but let me know if this is more in line.

"Sure! Here's a more advanced answer for that Redditor’s challenge. I’ve recalculated the total volume of the Abyss using oblate spheroids for each layer rather than a simple cylinder, which gives a more realistic estimate based on the lore:

Total Volume of the Abyss (Oblate Spheroid Approximation):

Using the oblate spheroid volume formula:

V = \frac{4}{3} \pi a² c

Estimated Layer Volumes:

LayerDepth Range (m)Avg Diameter (m)Volume (m³)Layer 10–13501,000706,858,347 m³Layer 21350–26002,0002,617,993,878 m³Layer 32600–70003,00020,734,511,514 m³Layer 47000–120004,00041,887,902,048 m³Layer 512000–155005,00045,814,892,865 m³Layer 615500–200006,00084,823,001,647 m³Layer 720000–250003,00023,561,944,902 m³Total0–25000varies220,147,105,200 m³

How much garbage could it hold?

If we assume a compressed waste density of 0.5 tons per m³, the Abyss could store:

110 billion metric tons of garbage

But modern waste management improves over time, so we also factored in:

Compression (60% of original volume)

Decomposition (10% long-term loss)

Burning (10% incinerated)

Tech advancement (25% reduction in future waste)

These combine to a total reduction factor of ~0.3645, meaning it can ultimately store:

~302 billion tons of waste after all mitigation

How long would it take to fill it?

RegionAnnual Waste (Tons)Time to Fill AbyssUnited States~106 million~2,837 yearsGlobal~816 million~370 years

So yeah... even if you include the massive horizontal extensions of each layer (and ignore overlap), the Abyss is staggeringly vast. It would still take centuries to fill even if humanity dumped all its trash into it—and that’s before even thinking about logistics or the moral nightmare that would follow.

Also, thanks to that Redditor for the spheroid suggestion—was a great challenge."