Optical Depths of Encrypted Lumination

The journey begins at λ = 550 nm, where covert signals scatter.

Transmission Constants:

Today's mission, should you choose to accept, involves locating the optical node at precise coordinates:

48.8566 N, 2.3522 E
(Decrypt to reveal Paris' clandestine rendezvous)

Deciphering light into silence requires patience:

Remember, wavelengths hide in plain sight.

Your next challenge awaits in the following depths: