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Potential air pockets on stricken ferry offer hope for survivors

By Euan McKirdy, CNN
updated 12:35 PM EDT, Thu April 17, 2014
STORY HIGHLIGHTS
  • Hundreds remain missing as rescue effort in Yellow sea continues
  • Passengers contacted relatives on land with harrowing text messages
  • Air pockets might provide some chance of rescuing survivors from within vessel, say experts

(CNN) -- As almost 300 ferry passengers -- many of whom are high school students -- remain missing amid a massive rescue operation in the Yellow Sea off Korea's southwest coast, the wait on land remains agonizing.

Many of those rescued had to leap off the side of the capsized ferry into water barely 10 degrees Celsius (50 degrees Fahrenheit), where they were picked up by one of the multitude of military and fishing vessels on the scene.

But others were told to stay put, even as the ship sank and not instructed to abandon ship.

South Korean President Park Geun-hye weeps while delivering a speech to the nation about the sunken ferry Sewol at the presidential Blue House in Seoul, South Korea, on Monday, May 19. More than 200 bodies have been found and nearly 100 people remain missing after the ferry sank April 16 off South Korea's southwest coast. South Korean President Park Geun-hye weeps while delivering a speech to the nation about the sunken ferry Sewol at the presidential Blue House in Seoul, South Korea, on Monday, May 19. More than 200 bodies have been found and nearly 100 people remain missing after the ferry sank April 16 off South Korea's southwest coast.
South Korean ferry sinks
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Photos: South Korean ferry sinks Photos: South Korean ferry sinks
South Korean ferry capsizes
Desperate search for ferry passengers
Rescue crews continue search for missing

Those trapped on board reached out to parents and relatives via text message.

"No phone connection so there is no Internet connection. So just sending text message," says one purported text message from a passenger obtained by CNN. "There are few people on the ship, can't see a thing, it's totally dark. So there are few men and women, women are screaming."

But with these panicked messages comes a reason to believe more survivors will be found.

Even though only a small section of the ferry's hull remains out of the water, rescuers -- including South Korean Special Forces divers -- hope that within the ship isolated pockets of air are able to support passengers still trapped within the vessel.

South Korean ferry rescue operation  South Korean ferry rescue operation
South Korean ferry rescue operationSouth Korean ferry rescue operation

"From the images that I've seen, there's clearly some areas of the hull that are above the water, that are not flooded," Mike Dean, the U.S. Navy deputy director for salvage and diving, told CNN Tonight.

"So absolutely, there could be areas in there where there is breathable air, but the trouble right now is the temperature and getting people to them."

Conditions are not ideal for the rescue effort, with potentially strong winds, fog and tidal currents making things difficult for ships and divers, maritime expert Kim Petersen told CNN. However he also sounded some hope that air pockets, also known as "voids", could provide those on board with a chance of survival.

"It's difficult to say since we don't know the cause of the vessel sinking," he said.

Did human error sink the South Korean ferry?
South Korean ferry rescue growing desperate

"If it had been because of a problem with one of the vehicle doors of course that could cause massive flooding very quickly and reduce the likelihood of voids, but the fact is that this is a vessel that is almost 500 feet in length and its sitting in waters that we believe to be between 70 and 110 feet deep, so there is the strong possibility that there are voids and the possibility of survivors."

However, Petersen warned that the effort to reach those trapped in potential voids will not be easy.

"The problem now is getting divers down into those areas and bringing those people to the surface. That's going to be a daunting proposition.

"We still have the issue with cold water and currents but right now the situation is fairly positive for trying to find survivors."

'We are not dead yet' passengers texted

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