Three codes were hidden in the HTML source of THE GATES OF HELL post on the Investigate Ingress blog.

[1] xkk13hsvvk745bx

[2] bhf82bc00o551wr

[3] a4p76ab8y7wrctor

Code #1

Observations

A bad keyword substitution…

Code #2

Observations

This code was still live at the moment of this post.

Hint: Treat numbers in groups, not has separate digits

Code #3

Observations

16 characters that will make your head spin