The initial response was the first line of defense for an industry facing the largest test of its clout in years.
But the larger test will be whether the strategy behind the deal materializes.
The Rainier test became the prototype for larger and more powerful underground tests.
The company said that it would soon start large human tests of LAF237.
It is their fourth and largest nuclear test.
The larger test is whether software will be developed that will make the machine popular.
China today set off the largest underground nuclear test it has ever conducted, the State Department said.
But by year's end, in one of the nation's largest tests of Internet security, the site will be back on line with new safeguards.
China, however, last month set off the largest underground test it had ever conducted.
That is 172 times more powerful than the largest nuclear test blast.