don't we all you can bring fish up from really deep you have to pop there swim blader to let the presure out or they will die but at that depth it won't be possible and there much cooler looking fish down there just think of the fish people HAVEN'T seen theres bound to be a much scarier fish mabye if you pressureised a tank and some how put the fish in there under presure mabye but getting the fish would be very hard and expensive more people have walked on the moon then have dived down that deep plus this magic presure tank hasn't been inventid YET