The game refers to the beam from your light when you arrive at the wreck, even if your light is off

[eriktorbjorn]

>LOOK
Underwater
You are in the sea, completely surrounded by water.

>TURN OFF FLAHSLIGHT
The flashlight is now off.

>LOOK
It's too dark to see.

>DOWN
The yellow beam from your light settles on a huge jagged outcropping of rusted
metal and barnacles. As you angle your light downward, you can barely make out
the shape of a monstrous corroded hull, partly buried in the silt from its
decades of slumber on the floor of the ocean.

You suddenly bump into something in the darkness. You find that this something
has long, sharp teeth that feel uncomfortable when they enter your body.

   ****  You have died  ****

Too bad.

That's because UNDERWATER-D only checks if you've arrived at the wreck, not if your light is on:

           (<==? ,DEPTH ,OCEAN-BOTTOM>
        <COND (,WRECK-CHOSEN
               <TELL
"The yellow beam from your light settles on a huge jagged outcropping of
rusted metal and barnacles. As you angle your light downward, you can
barely make out the shape of a monstrous corroded hull, partly buried in
the silt from its decades of slumber on the floor of the ocean." CR CR>
               <RETURN ,WRECK-1>)
              (T
               <TELL "You flutter down to the ocean floor..." CR CR>
               <RETURN ,OCEAN-FLOOR>)>)

[eriktorbjorn]

There are other things under water that you can see even if the light is turned off. Some examples:

• The swinging line outside the wreck. (I-PENDULUM)
• The squid attacking. (I-SQUID)
• The water level rising in the glass case, eventually ruining the stamps. (I-CASE-LEAK)

I'm sure there are even more. Of course, you don't really have any reason to ever turn off the flashlight.