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The last cruise of Mikhail Lermontov

>> reporter: it's incredibly heavy. >> 37 pounds. >> reporter: divers will be hooked up to a command center. >> these instrument instruments are telling us the depth of the divers. this is the pressure of the the air going through them the main air, stand-by air, emergency air, diver one, two, three, which is your safety diver. >> reporter: the divers will probably be under water for up to 80 minutes at a time until which they'll end up inside a decompression chamber to cover. >> you can get down there, these will have rough edges, it will be dark. it will not look like a textbook situation. >...

>> one thing you don't want to do is add more tragedy to tragedy. you don't want more loss of life. you want to plan your time and wait for optimal condition go in there. >> reporter: the plane is believed to be at the bottom of the sea and at that depth they'll need to use special gear. >> it's dry sealed at the wrists and the boots are incorporated and the zipper closes at the neck. that way no water gets in there. then what you have is a helmet. this is a 17 super light. >> reporter: this considered a lighter one. >> yes. >> reporter: but it's incredibly heavy. >> 37 pounds. >> reporter: di...

Divers are at. this is the pressure going through them. the main air, stand by air. emergency air, diver one, diver two, diver three which is your safety diver. >> reporter: he says the divers will probably be underwater for up to 80 minutes at a time. and then you get in a pressure university. >> this will have things to get in. it's going to be dark inside. a lot of things for divers to get snagged on. >> reporter: then there's the emotional component, right, you know there's going to be bodies down there? >> there's nothing worse than bumping into a bloated dead body in the water. >> report...

Hampered search efforts. >> one thing is you don't want to cause any further loss of life. so. >> the plane is believed to be the in water about 150 feet deep. divers need to use special gear. >> a dry suit is sealed at the wrists and a seal that zippers close and closes at the neck. so no water gets in there. and you have a helmet. this is a super light. >> but it's incredibly heavy. >> 37 pounds. >> divers also hooked up to the command center like this one. >> these instruments tell us what the depths of divers are at. and this is the pressure of the air going through them. the main air, sta...