Abstract: A method of disposal of waste solid material in an underwater geologic fotion on the continental margins comprises the steps of: drilling a large diameter hole into the geologic formation to a depth of several hundred feet in a single stroke operation; depositing a slug of a paste of waste material into the bottom of the hole thereby burying the slug; and permitting the geologic formation adjacent to the hole above the buried slug to fill the hole above the slug, thereby sealing the buried slug in the geologic formation. A continuous slug of waste material can be used, or the waste material can be formed into discrete charges of material.

Abstract: An arrangement for removing toxic sedimentary material (101) from a large dy of water (102) by forming a large number of core holes (100) in at least the sediment layer (101); inserting sediment trap receptacles (200) in the core holes (100); allowing the sediment trap receptacle (200) to fill up with toxic sediment (101); and then withdrawing, emptying and reinserting the trap receptacles (200) within the core holes (100) to effect the removal of the toxic sediment (101) from the body of water (102).