| The safety diver swam in front of the aquanaut, who seemed to be having trouble, and gave him the OK signal. |
| To become an aquanaut you've got to have a hot research proposal that requires steady, long periods of time studying the ocean itself or its inhabitants. |
| Then again, an astronaut or an aquanaut sees unimaginable new worlds, whereas your brother sees only a monocolor haze of varying intensities. |
| The aquanaut was put to bed, and care was administered in accordance with the instructions from the topside physician. |
| An aquanaut looks out into the ocean through a habitat porthole covered in plexiglass. |
| Such protection is not afforded the aquanaut, for he is exposed to high ambient pressures of inert gases over considerable periods of time. |
