[propbeanie]

Anytime you are above PD and call for a change in depth down, you will get the sound. If you are below PD and change depth to lower, you should NOT get the sound. but if you are at say 13.8m in a IXD2, due to rough seas, and call for 100m, you will get the dive alarm, even though you are already submerged, since PD is set at 14m. If you called for PD, and are already there, you should not hear the alarm, nor if you call for deeper from there. Say you call for a regular dive to PD from the surface, you will get the dive alarm, and then you decide you need to Crash Dive since the plane is closing fast, you will again hear the dive alarm, in addition to any other sounds associated with a Crash Dive sound, even if you are already at 10m depth. If you are hearing the alarm while at PD or deeper and then calling for deeper water, something is most likely wrong with the boat's configuration somewhere.