There’s never a dull day (or picture!) when you’re participating in @ESA_CAVES.

There’s never a dull day (or picture!) when you’re participating in @ESA_CAVES. 6 ‚cavenauts‘ are currently underground under the leadership of @Astro_Alex conducting #science in hard-to-live spaces #ImageOfTheWeek http://www.esa.int/spaceinimages/Images/2019/09/Into_the_deep … pic.twitter.com/AuIydfwaVX