There are many people using Soratama underwater by fixing it into housing. Currently we do not offer support to this.
However please refer to the following page.
http://dc.watch.impress.co.jp/docs/review/omoshiro/20140909_665266.html
Also, there is a Facebook group for Soratama and information are being exchanged.
https://www.facebook.com/groups/832273703465153/