The Marshall Islands, not the U.S., had the main responsibility for safety inspections on the Deepwater Horizon.

Reporting from Washington —

The Deepwater Horizon oil rig that exploded in the Gulf of Mexico was built in South Korea. It was operated by a Swiss company under contract to a British oil firm. Primary responsibility for safety and other inspections rested not with the U.S. government but with the Republic of the Marshall Islands — a tiny, impoverished nation in the Pacific Ocean.

And the Marshall Islands, a maze of tiny atolls, many smaller than the ill-fated oil rig, outsourced many of its responsibilities to private companies.

Now, as the government tries to figure out what went wrong in the worst environmental catastrophe in U.S. history, this international patchwork of divided authority and sometimes conflicting priorities is emerging as a crucial underlying factor in the explosion of the rig.

Under International law, offshore oil rigs like the Deepwater Horizon are treated as ships, and companies are allowed to "register" them in unlikely places such as the Marshall Islands, Panama and Liberia — reducing the U.S. government's role in inspecting and enforcing safety and other standards.

"Today, these oil rigs can operate under different, very minimal standards of inspection established by international maritime treaties," said Rep. James L. Oberstar (D-Minn.), chairman of the House Transportation Committee.

Some offshore drilling experts, as well as some survivors of the explosion that led to the massive spill, say foreign registration also permitted a confusing command structure and understaffing — factors that may have contributed to the disaster.

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