Altar found in ancient Greek shipwreck

Divers have recovered an altar from a 2200-year-old shipwreck off the Aeolian Island of Panarea just north of Sicily. 

http://www.thehistoryblog.com/archives/33149

Religion Aboard Ancient Merchant Ships

http://www.journalofhellenicreligion.markoulakispublications.org.uk/volumes/religion-aboard-ancient-merchant-ships

Istanbul shipwreck

Fantastic 4th century BC shipwreck off Cyprus

Ancient ship found off the coast of Italy

A Mycenaean shipwreck

Pseira shipwreck in Archaeology Magazine

more on roman shipwrecks discovery

Five Roman-era shipwrecks found