The strong earth quake off Taiwan on Tuesday night that cut undersea cable brought down Internet and long distance telephone calls for several hours.
At my work place we have several LL from VSNL and one of them went completely down. Thanks to some smart networking and routing traffic was routed via other providers.
Most ISPs in India use Singapore Telecommunications (SingTel). The work is in progress and it will take 2 weeks to fix cable.
=> Total 6 undersea cables are out of order
=> Disrupts telecommunication across Asia
=> In India, back offices and call centers experienced some difficulty
=> Many ISP were down or working extremely slow
But thanks to superb network design and multiple service providers most services back online now.
More information is available here