I feel for the divers doing recovery in Toledo Bend.  It is a nasty lake.  There are two kinds of lakes in Texas.  Mud bottom and rock bottom.  Toledo Bend is mud.  Not particularly deep (80FFW I think) but the water is black.  Not blue, not green, black.  Been in a couple of those lakes here and when you are looking for something you find it when you run into it.  Fortunately, there are lots of fixed objects (trees) stuck in the bottom. Unfortunately the treetops are full of monofilament line (I have donated to that monofilament collection as has probably anyone else that has fished there.)

There is an exact opposite case in Texas.  Athens Scuba park. There the viz can also be zero but it is in milky white instead of black.  It is an old clay pit.  When you touch the bottom a cloud of clay puffs into the water.  After a few hundred OW students get in the water, you pretty well cannot see your gauges at the end of a hose.  There is no current.  There are plenty of fixed objects but navigation is a challenge.

Sitting on the surface one day, I told the student I was with to take a compass heading towards the tail of a plane that was sticking out of the water.  After going what I knew to be too far, we surfaced.  We could not have missed it by more than a foot or two (it was between where we had been and where we were) but we nonetheless missed it.

CH