Good story.  Thanks for helping out this beluga.  Unfortunate that Tyonek (beluga), will need to find his family in order to survive in the wild.  Regarding what lead to this stranding.   I wonder what was going on a the drilling rig that is right there that appears to be a few hundred yards out in the picture.    It oesn't take much noise to confuse young cetaceans that are extremely sensitive to underwater acoustics.  A bit of passive underwater acoustic monitoring would could give more information on what was happening in Cook Inlet; and particularly, at this specific location (see the picture with the drilling rig in the background).   Or is the stranding related to the Naval War games in the Gulf of Alaska?  Murkowski requested the games get moved to the fall into September?.    Despite the good intentions of the rescuers in this case, big questions to why the stranding took place and why the baby kept swimming back.