Despite being 250 feet below the surface, the area where the scubasphere is located is bright and the surface can be seen.
During the tropical storm, an air tank falls on the open hatch of the scubasphere and damages it beyond repair, leaving Mike stranded on the bottom of the ocean until a replacement hatch can be delivered. The ship later returns and sends down a replacement hatch for Mike to install. The problem is that that hatch closes from the inside of the scubasphere, so how did Mike get the new hatch inside to install it?