* Fukushima Daiichi nuclear disaster:

* Multiple meltdowns; nuclear waste contamination.

- Radioactive material released into environment.

* Cleanup efforts since 2011:

- Complexity; High levels of radiation; Remote operations.

* Recent findings:

- Robots sent into reactor vessels.

- Cameras provide detailed images of internal structures.

- Extent of damage; debris more significant than expected.

* Implications:

- Removal process might take longer; more complex.

- Decommissioning; estimated completion in decades.

- High costs associated with cleanup.

* Challenges:

- Developing new robotics technologies.

- Minimizing human exposure.

- Ensuring successful removal without further accidents.

* Potential impact on other decommissioning projects:

- Learning lessons; applying improved strategies elsewhere.