When Senator and Mrs. Bartholomew are getting ready to leave Goliath, Dr. Marlowe advises her to hold onto her husband's belt as she follows him. She proceeds to do this as they enter the water. The next scene shows her leading the Senator as they swim through the underwater passage.
When Ryker goes back into the water to assist Peter and Lea, he and Peter talk to Lea underwater in an effort to calm her down. However the three of them are wearing the basic breathing masks supplied to the other Goliath survivors, which do not have the communication system used in the diving helmets.
When the ship "Goliath" is sunk in the opening sequence it shows the ship broken and sinking in two equal halves, each tilted about 40° toward what had been the ship's midpoint and many yards apart with debris pouring from each ruptured section. In the next sequence when the ship is viewed with a sonar scanner the ship is one piece.