Netrunner LCG: The Underway Data Pack - Rules of Play says:

SanSan is the cradle of high-end tech, home to beautiful beaches, and the host of the World Expo. It is also still recovering from “The Big One,” the cataclysmic earthquake that opened up the San Andreas fault and redefined America’s western coast. This new space, now dubbed “The Underway,” is a motley assembly of many different architectural styles, ethnicities, and cultural influences. It’s a hotbed of holographic artists, indie studios, and the birthplace of Jank-Juke-Jazz. It has also become synonymous with gang activity, particularly that of Los Muertos, a street gang whose members are identified by their bioluminescent tattoos and that deals in illegal tech as much as it deals in flesh and drugs.

Accordingly, the sixty new cards in The Underway (three copies each of twenty different cards) dabble in an eclectic mix of upgrades, assets, and resources, as well as a handful of illicit hardware and programs. Meanwhile, everything seems to run through Los Muertos, and even as the gang’s criminal influence bolsters the Criminal faction, it pervades everything in this Data Pack. It starts with a new Criminal Runner identity, it reaches outward as other Runner factions are supplied with the sort of tech you don’t normally find in America, and it ripples into every aspect of every card as Corps are forced to deal with the gang’s members in one way or another.