@PJ2 in this picture of F-GZCP I see the text"do not walke..." only two times written on each wing
http://images3.jetphotos.net/img/1/7...1238106997.jpg
Currents must have been really slow compared to the rate of fall through them.
@JD-EE, if a light peace will fall with mayby 0,6 m/s and if the currend moves with the 0,1 m/s, than it will move horizontaly around 600m after the falling time over 4000 m.....
and compared to a heavy part, falling mayby between 4-10 m/s the same currend will be very slow, it moves <50m horizontal
a slow deapwater currend with 0,1 m/s will flow very laminar, and after a longer time there is no reason that the speed will be much different in different levels, the deapwater currend is part of a big stream with amount the same water volume like the golf stream, until it is the backroute of the same water... grity