From the AP via USA Today (link):
Twenty-two Chinese nationals were in custody Wednesday after they apparently let themselves out of a 40-foot cargo container that had been used to smuggle them from China, officials said.
The 18 men and four women, all believed to be in their 20s and 30s, seemed to be in good physical condition after about two weeks in the container, said Michael Milne, a spokesman for U.S. Customs and Border Protection.
Port of Seattle security guards spotted the group about 1 a.m.