Please can someone help me??

Who can help me to find Derren.
18 october I met him in Den helder. (Holland).
I am in the navy en he also.
His schip is the RFA Mounts Bay.
And stay's a couple of days in holland. Today there are coing away.
I am not sure but I think that he is a diver. And I know he is 28 years old.
But I don't ...