# Crystal water molecules occupying a strange position

**URL:** <https://gromacs.bioexcel.eu/t/crystal-water-molecules-occupying-a-strange-position/10465>\
**Category:** User discussions\
**Created:** [November 1, 2024, 5:26am UTC](https://gromacs.bioexcel.eu/t/crystal-water-molecules-occupying-a-strange-position/10465 "2024-11-01T05:26:16Z")\
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**Author:** ![MagnusL](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/magnusl/32/2380_2.png) [@MagnusL](https://gromacs.bioexcel.eu/u/MagnusL)\
**Post date:** [November 2, 2024, 10:25pm UTC](https://gromacs.bioexcel.eu/t/crystal-water-molecules-occupying-a-strange-position/10465/4 "2024-11-02T22:25:28Z")

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See, e.g., [Gas or Vacuum phase - #2 by jalemkul](https://gromacs.bioexcel.eu/t/gas-or-vacuum-phase/4387/2) for information about simulations in vacuum.

I’m not sure how running EM in vacuum would prevent the crystal water molecules from leaving their binding sites, though.

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