page_title: THUMS Islands
hierarchical_section_title: THUMS Islands
caption_attribution_description: English: THUMS Islands.
context_page_description: The THUMS Islands or Astronaut Islands are a set of four artificial islands in San Pedro Bay off the coast of Long Beach, California.
context_section_description: The THUMS Islands or Astronaut Islands are a set of four artificial islands in San Pedro Bay off the coast of Long Beach, California.
caption: Island Grissom, one of the THUMS Islands
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