Option A: Scattering of Cremated Remains upon the Sea 3 miles from closest land:  
Urn not required.

 $120.00

$    0.00
$120.00

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Option B: Placement of Urn on the Sea bed 3 miles from any land:
Biodegradable Urn Required for this option: 

 $120.00

 $150.00 to $275.00
$270.00-$395.00

These biodegradable urns are engineered to float momentarily and then gracefully sink. On the ocean floor, the urn will break down naturally over time.

$150

This scallop-shell urn will float for approximately five minutes before descending gracefully. The urn will break down naturally over time.

$275

When placed in water, this elegantly traditional urn made of gelatin and sand will float briefly and breakdown within three days.

$275

The U.S. Environmental Protection Agency requires urns used for placement of ashes on the seabed to be water-soluble and biodegradable. These urns offer a sensible, environmentally safe and friendly alternative for scattering cremated remains of loved ones. This dissolvable urn is crafted entirely of natural clay finished with water-soluble non-toxic coloring. 
Mainely Urns, Inc.

Definitions:

Unattended
Scattering
Placement