I’ve seen a number of media outlets including CNN falsely regurgitate that bin Laden was buried according to “Islamic law.”
Deceased in Islam are buried the following way:
1) Given a ritual bath called ghusl.
2) Wrapped in a white shroud.
3) Have a prayer performed over them called Salaat Al-Janazah.
4) Buried under the earth facing Mecca.
It is not the Islamic tradition to perform burial by sea. In an extremely dire circumstance in which a fear of disease spreading if a corpse is left on a ship for a prolonged period of time, then the necessity of the circumstance would dictate burial by sea.