dcblogs writes: Two monolithic buildings in lower Manhattan that serve as major network hubs for the U.S. are operating on generator power, thanks to Hurricane Sandy. The buildings, known as carrier hotels, are a 2.9 million square foot structure at 111 8th Ave., and a 1.8 million square foot facility at 60 Hudson St. Telecom companies use carrier hotels to interconnect networks to allow data sharing and users of one network to connect with those of another. The two buildings are critical to the nation's infrastructure. In 2002, Richard Clarke, then special advisor to the president for cyberspace security, described their importance in a speech. "Transatlantic fiber lands at about 10 different places in Massachusetts, Rhode Island, Long Island and New Jersey that, after having landed, it all goes to one of two facilities — 60 Hudson St. or 111 8th Ave in lower Manhattan. If that's true, that would seem to be a problem." Michael Levy, an analyst at Datacenters Tier1 Research, a division of 451 Research, said that "111 8th Ave. and 60 Hudson are two of the most carrier dense buildings in the world." Google owns 111 8th Ave., but isn't commenting on its storm prep for the building.