To take with you a piece of the ocean that covers the sixth moon of Jupiter, you do not need to descend to its surface. A device that will fly past Europa after the eruption of its giant geysers will be able to take samples of the liquid, even if several weeks pass after the end of the eruption.
Under the ice crust, Europe is covered by a salty ocean. Its existence was discovered in 2012, when the Hubble Space Telescope discovered huge geysers in Europe, the emissions of which are visible even from space. This made Europe one of the first candidates for research missions: where there is water, there may be life. Both NASA and the European Space Agency have mission projects that will at least fly past Europe.
New calculations by NASA's Jet Propulsion Laboratory show that it will be enough to just fly by: the device will be able to collect particles of water vapor, the analysis of which will tell a lot about the composition of the solution that splashes under the ice of Europe.
Years have passed since the last eruptions, and no one can guarantee that new cataclysms will occur during the visit of the apparatus. However, as calculations show, this is not necessary: moisture particles that enter the atmosphere of Europe sometimes remain in it, so it will be enough for the device to simply fly through the upper layers.
Ejected by enormous pressure from under the ice shell of Europa, water particles with substances dissolved in it find themselves in the upper layers of the satellite's atmosphere. Then they fall to the surface of Europa under the influence of gravity, but sometimes evaporate or rise up after colliding with charged particles that reach Europa through the magnetic field of Jupiter.
Therefore, a sample of the atmosphere can tell a lot about the composition of the icy soil and even the ocean of Europe.