Never fear the deep

Dear Sir/Madam,

I am a navy diver and am looking to have a (semi) official crest made up and would appreciate it if you could tell me the translation of- Never fear the deep/ Fear not the deep. I am led to believe it is Non timetis altum. Is this a direct translation or no where near it?????
I look forward to your reply

There may be someone here who can help, but be warned: these people don't like talking l*tin, the website is used for discussing English phrases - not translating dead languages!!!!

At one point, the requests for translation were overwhelming. Or, at least, whelming. I don't know a drop of L*tin so I can't help anyway.