Miscellaneous: Ancient SOS - Item Catalogue - UO Stratics
General Information: An Ancient SOS message is a more valuable version of the Waterstained SOS message. The Ancient SOS will show the location where a fisherman can fish up a level 4 treasure chest. Inside the chest, there will be a Fabled Fishing Net in addition to the normal loot.
About 1 in every 25 Message in a Bottle will turn into an Ancient SOS when opened.