Here is the approach they were attempting to shoot for KAL 801. If you can read this plate the approach flies over the navaid and out the opposite radial to a minimum descent altitude of 760 feet with the last portion of the descent happening 1.3 DME outbound from the station. I think they read the plate wrong and tried to get to 760 either at the navaid or 1.3 miles short of the navaid and put themselves into Nimitz Hill. The pictures of the wreckage showed the aircraft coming to a stop just to the north of the VOR antenna. Not good.
I did just hear an NTSB statement that the crew of the ASIANA mishap cycled through a bunch of different autopilot modes attempting to get set up for the visual including several auto throttle modes. I am betting in the end they kicked off the auto throttles without realizing it and that is how they got so slow. Still no excuse for the PNF or PF to not catch that.