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It is Ardipithecus,' said Dr White.'Darwin said we have to be really careful.

'He's a hero who must be recognized along with his 43 other crew members.

She lived at the dawn of a new era, when chimps and people began walking (or climbing) along their own evolutionary trails.

It was advised to divert to Mar del Plata to have the problem fixed, and the captain later commuincated via satellite phone that the problem had been contained.

That was the last communication received from the submarine before a loud noise, possibly and implosion, was detected from around the area where it vanished.

This is Ardi - the oldest member of the human family tree we've found so far.

Her discovery, reported in detail for the first time today, sheds light on a crucial period when we were just leaving the trees.

He said the rescue efforts had already been 'extended for more than twice what is estimated for a rescue.''We've had 28 ships, nine aircraft, 4,000 people involved, 18 countries supporting,' he added. I'm destroyed.'Among the missing, now presumed dead, is 35-year-old Eliana Maria Krawczyk, Argentina's first female submariner.

'Despite the magnitude of these efforts, we've been unable to find the submarine.'Some relatives of the crew broke into tears after they received the news.'I don't understand this arbitrary and unjustified decision,' Luis Tagliapietra, the father of 27-year-old crew member Alejandro Tagliapietra, told local TV. The San Juan last made contact with commanders on November 15 to report that water had entered the vessel through its snorkel and caused a battery fault.

Experts say refits can be difficult because they involve integrating systems produced by different manufacturers, and even the tiniest mistake during the cutting phase can put the safety of the ship and crew at risk.

At the sub's home naval base in Mar del Plata, relatives were hit hard by Thursday's announcement.

But this does not explain why Ardi's species was bipedal (able to walk on two legs) while still living partly in the trees.