I really recommend reading the blog post though. It goes into detail on some of the engineering and security considerations that went into the design, as well as how the rollout is handled.

The triple ratchet extends the double ratchet with a second, sparse post-quantum ratchet called SPQR. SPQR is based on a chunked version of ML-KEM 768. The outputs from both are passed to a KDF to form a hybrid KEM.

This gives a whole new meaning to APT.

Excel is Turing complete. Just sayin.

In the EU (Sweden) we (and Google) are apparently still not wholly convinced.