Bubbles
Filters
Both words in one sentence
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The former exhales directly into the water (leading to the characteristic bubbles), while the latter simply filters out the CO2 and adds oxygen so the nitrogen can be re-used.
Source: Artificial Gill -
This is particularly evident in the underground level, where greenish-blue lighting filters in from above, and dust motes float through the light like tiny bubbles.
Source: Video Game / Journey
Cite this Source
Filters and Bubbles. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/bubbles/filters
Bubbles & Filters. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/bubbles/filters>.
Filters or Bubbles. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/bubbles/filters.
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