Knots at 50 cm intervals on lifting-lines, enable manual lifting of casualty, who may weight up to 120 kg.

Two knot lines enable up to 4 people to take part in lifting the casualty at a time in standing, sitting positions.

Single handed rescuer can split the weight if he/she is  able to fasten each line and hoist gradually one line at a time one metre and fasten it..

When you lift under the knots, you use your energy 100% to lift in stead of squeezing the rope.

Average person is around 80 to 110 kg when lifted from sea. It is realistic for one person in such situation to lift manually 50 to 60 kg.

Never try manual lifting of two persons in the net at the same time. It is impossible even for 6 grown persons together with a line each. You may strain your back and damage it forever.