Somebody had the idea of towing a CG-4A glider (Hadrian) across the North Atlantic. It seems a remarkably risky stunt even for WW2 times. Any problem on tow with the weather or turbulence causing a tow rope separation the glider crew would be down in those cold waters. But they crossed successfully. It seems nobody made a habit of it though.
What possible circumstances would have compelled the RCAF, RAF and/or the USAAF to attempt to undertake these flights frequently and regularly?