During a heavy rainstorm, an ILS approach to runway 31 was initiated by the aircraft. The captain, focused on visual contact, failed to adequately monitor the approach and didn’t notice the descend through the minimum altitude of 415 feet. The co-pilot, descending below the glide slope, experienced an abrupt heading change, likely due to downdrafts, resulting in a high rate of descent and a crash into the sea short of the runway. The incident was likely caused by a combination of inadequate pilot monitoring and co-pilot error.During a heavy rainstorm, an ILS approach to runway 31 was initiated by the aircraft. The captain, focused on visual contact, failed to adequately monitor the approach and didn’t notice the descend through the minimum altitude of 415 feet. The co-pilot, descending below the glide slope, experienced an abrupt heading change, likely due to downdrafts, resulting in a high rate of descent and a crash into the sea short of the runway. The incident was likely caused by a combination of inadequate pilot monitoring and co-pilot error.