    Time Left
  There  is  approximately 3 hours of cruising time in  the  sub. 
This time can be shorter due to extensive use of the robotic arm, 
the camera or the outside light. Do not be discouraged from using 
this  equipment as there should be sufficient time. These  pieces 
of equipment are needed to accomplish the missions and enjoy  the 
surroundings.  'T'  is  a toggle that  simply  reports  the  time 
remaining  to help you keep track, you do not want to run out  of 
power at the bottom of the Romanche Gap! Happy hunting.