"...a minimum of twenty 2-inch (5 cm) holes be drilled into the casket to facilitate rapid flooding and venting of air. The holes should be evenly spaced on the top (8 holes), bottom (8 holes) and head and foot ends (2 holes each) of the casket. The holes may be covered with a porous material like cloth or paper so that the remains are not visible, as long as plastic-containing adhesives like tape are not used..."Additional guidelines at the EPA webpage with guidelines for burial at sea. What is interesting to me is that burial at sea is permitted for anyone - not just naval/military personnel - and it need not involve a casket:
If no casket is used, EPA recommends wrapping a natural fiber shroud or sail cloth around the body and adding additional weight, such as a steel chain, to aid in rapid sinking.You just have to go three miles offshore and follow the other guidelines (no wreaths etc, no pets, no burning Viking boat) at the link.
If anyone is looking for an inexpensive alternative to a traditional burial, this is worth considering.