The invention relates to a combination of containers intended to discharge radioactive substances into the earth's magma by pouring them into lava lakes, and to a method for using these containers. The radioactive substances are preferably placed in ovoid waste containers that are loaded into a transport container and discharged therewith into a lava lake. The transport container decomposes by melting following a first immersion at a given depth and releases the waste containers, which continue to move downwards.
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