I did some research since I never heard of it and couldn't find any comment / feedback at all due to it being relatively new to the cloud mining world so for now, if I were you I wouldn't invest my money there, wait for some feedback's from other users on the following sites and see if they could be trusted:

http://scamanalyze.com/check/sea-mining.com.html
https://bitmakler.net/sea-mining___investmentfund
http://sitealways.com/www/sea-mining.com

And lastly, kindly remove the referral link you posted, it's forbidden in this forum, thanks