: Oh, we've got sonar, lidar, and magnetometer traces galore. We beat
: the nose flat on a very expensive sonar fish one day.

: This is a man-made lake for power generation. The original lake bed
: is the deep part where we're concentrating the search, but most
: of it is about 20 feet deep or so. The are rock formations that
: come out of nowhere in the middle of a flat plain, and go
: vertical to within inches of the surface. Bad towed sonar
: conditions. The lake is a 'T' shape, about 2 miles by 3 miles.
: It's big. It used to be used for logging, so there's lots of old
: log boom chains on the bottom. I've got a map with over 300 mag
: hits on it.

: The military and the oceanographic guys had a (top secret at the
: time) lidar system there for a while, and an ROV. The ROV's
: operator, used to salt water searches, was confident he'd be
: successful in no time flat. We told him the conditions we'd been
: diving in. Very low vis due to tannins, three feet of loose silt
: causing complete silt-outs if any contact is made with the
: bottom, etc. The first ROV splash, they thought their camera had
: malfunctioned. They brought it up, attached a third camera and
: tested the other two. Down it goes, absolute soup on the screen.
: They asked us to look, and we said, "Yeah! That's exactly
: what we see down there!"

: One summer, they had a GPS transmitter for accuracy within inches,
: computers linking the sonars and GPS, and ran patterns for a
: week. We got some interesting targets, but the computer's CPU
: speeds were not up to the task, and the sonar target 'marks' and
: GPS coordinates weren't syncing right. The had a target one day
: they thought was 20 feet high off a 35 foot bottom. Hugh mound.
: My partner and I were the divers for the day, so we dropped off
: the zodiac by the pontoon boat, straight down to a flat bottom.
: I ran out a 100 foot reel and did a 360 sweep to see if the line
: snagged anything. Nothing. Thats the way it goes out there on
: this monster damn lake.

: There's been hundreds of man-hours, and hundreds of bottom time
: hours by my group, military divers and others, but the Hudson is
: still hiding.

: We'll find it one day.

: Kirk

Shouldn't hide that well, a Hudson isn't little.

Maybe they went into some other lake?

Bill H.