Immersion shielding
Immersion shielding was a deflector shield technology installed aboard the  for use in entering environments with particularly dense atmospheres, such as gas giants or underwater.

This technology was used by members of the  crew in 2375, during the Flyers maiden voyage in an attempt to retrieve Voyagers multi-spatial probe from the atmosphere of a gas giant in the Delta Quadrant. ()

It was used again later that year when the Flyer was taken to extreme depths of the Waters. () 

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Shield technology