Yep, way deeper....70’ deeper. 40M/130’ is the limit for compressed air. Anything over is no longer ‘recreational diving’ and instead becomes ‘techinical diving’ which requires considerably more certification and generally requires the use of mixed gas (trimex). They likely stopped digging at 196’ because at 197’, you need hypoxic trimex, which gets stupid expensive.
I’d much rather spend my underwater time off Taiwan by the light house. Super clear water and lots of things to look at.