there is bob barth as a young man helping a diver jumps down.he reason they aren't wearing their gear and just swimsuits -- i don't know if we can see this. we can't see it very well. let's back up for a second. they are swimming over to the pressurize the elevator that's taken down and looks like this. this is another prototype is only the second one that has ever been built. the aquanauts are in sight and you can see the chamber right here. it decided it but what i want to point out is this could be dicey operation on the ship and its moving if you use your pressure everybody dies and it's that simple. it's quiet and it doesn't look like much, the fireworks of a rocket have tended guys not a pretty death with the explosive decompression know what happened so these are critical moments and they were learning to do it properly to make it safe and this was a state of the program if anything went wrong that could be really bad for the program. so, you will see he as the sealab moves along that it looks less permanent and a little more modern shall