Maritime archeology

Hi all, it's a little difficult to write about a postgraduate course, because I not even know if I will finish this major. But if I graduate from public administration, I think that I will consider taking a postgraduate course... I have not thought yet about what. It could be of a subject that interested me before public administration, such as: history, anthropology, archaeology, education, etc. Before deciding to study public administration I really wanted study anthropology-archaeology (at Universidad de Chile university), at that time I thought study maritime archeology abroad (maybe in Mexico, Argentina or Spain,
among other options), so I think that after graduating from this major I will take a course about archaeology or maybe anthropology. I like archaeology because I consider that discipline help conserve part of the history that should not be so undervalued. 
The underwater archaeological sites are a valuable source of historical information because, thanks to the lack of oxygen, they usually keep material that has disappeared in the deposits located on the mainland. In Chile could be interesting to study, for example, the Moais that are submerged underwater in Isla de Pascua. Also, we have a very long coast and maritime territory. So, I would like to study about it abroad or in Chile, like a part-time course because I also have to work, obviously