From http://www.redcross.org/images/MEDIA_CustomProductCatalog/m3640104_IHL_SummaryGenevaConv.pdf
Arts. 12, 18
This Convention mandates that parties
in battle take all possible measures
to search for, collect and care for
the wounded, sick and shipwrecked.
“Shipwrecked†refers to anyone who is
adrift for any reason, including those
forced to land at sea or to parachute
from damaged aircraft.
Yes, that’s why it’s considered bad taste to stand at the rails with a rifle and pick off survivors in life rafts....