Lloyd helicopters (Adelaide base) used static line pickups (for training) of South Australian Police (STAR GROUP) from deep water a few hundred metres from the beach back to the beach. Done in a B206L1 (C28 with water meth and all the rescue / ems gear- upgraded to a C30) in the 1980s til replaced with a 412 in 1990 ish. Plenty of rappelling trading done too. I’ll dig out a pic of that
VH-BJX