Black Elk Energy has called off its rescue efforts in search of the crew member who has been missing since last Friday, when an oil rig exploded in the Gulf of Mexico.

"Since the incident took place, Black Elk said it has performed a search operation with the help of private industry experts."

The announcement came after rescue experts, who were engaged in Black Elk’s 100-hour long continued search efforts, advised the company to suspend the formal operation.

Since the incident took place, Black Elk said it has performed a search operation with the help of private industry experts.

It also worked with both state and federal agencies such as Plaquemines Parish, the United States Coast Guard and Bureau of Safety and Environmental Enforcement in executing the overall search operation for the worker, now presumed dead.

The US Coast Guard joined the search operations for about 32 hours and later suspended the search pending further developments.

Black Elk used about three commercial dive boats to search about 1,400 square miles in Gulf waters, followed by beach and near shore searches near Louisiana.

In a latest statement posted on its website, Black Elk said: "We also completed a perimeter search surrounding the platforms up to and extending 150′ outward."

"We will continue to remain focused on the victims and their families, including those injured in the incident. An official investigation is underway and we will continue to cooperate with all authorities as this process develops," the company’s statement added.

Initially two members were missing, but a private dive team found the remains of an unidentified person on Saturday.

The US Chemical Safety and Hazard Investigation Board (CSB) has issued a subpoena to the rig operator seeking details of incident.

Meanwhile, the US Bureau of Safety and Environmental Enforcement (BSEE), which controls offshore oil and gas drilling and production, has started its investigation process on the blast.

Most of the crew members, including the missing and dead personnel, are said to be Philippine citizens.