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This article talks about exploration in the Antarctic's ancient glaciers.  NASA is exploring these areas of the world because they are isolated, have not been disturbed, and are similar to conditions on other planets, such as Mars.  NASA's exploration into this glacier discovered some "very hardy bacteria" that was able to survive in this harsh environment.  NASA's robotic submersible could have disrupted this otherwise untouched ecosystem.  This perfect ecosystem also could house bacteria that could be harmful to humans, and was only surviving here, isolated from everything.  NASA's robotic submersible is still disturbing untouched ecosystems, and this could have serious consequences to the species that are surviving there. To keep these ecosystems form being destroyed NASA could use smaller robots to view these ecosystems, similar to the technology that enables doctors to put tiny cameras inside of people.  This could limit the effects of human interference in these unique ecosystems, and it would be better than sending a baseball bat sized camera.