The CEO of the firm that operates the missing Titanic submarine, Titan, has previously shared his fears about what would stop him from getting to the surface.

OceanGate Expeditions chief Stockton Rush spoke last year about the things that concern him surrounding the missions but did argue he ultimately thought it was safe.

He is one of the crew of five people on the mission to some 2.4miles below the surface of the ocean to visit the Titanic's wreck, but which has since lost contact with its mothership.

READ MORE: Three Brits residents on missing sub trip to cursed Titanic – including father and son

Signal updates that were due to be sent out every 15 minutes to the mothership halted just one hour and 45 minutes into the mission.

In last year’s extended interview, Rush appeared to be aware of the risks, but said he believed crew members would have enough oxygen to survive.

Speaking to CBS News about what concerned him, he said: “What I worry about most are things that will stop me from being able to get to the surface.

“Overhangs, fish nets, entanglement hazards. And, that’s just a technique, piloting technique. It’s pretty clear – if it’s an overhang, don’t go under it. If there is a net, don’t go near it. So, you can avoid those if you are just slow and steady.”

Speaking about the overall risk though, he added: “I don’t think it’s very dangerous. If you look at submersible activity over the last three decades, there hasn’t even been a major injury, let alone a fatality”.

Discussing the mindset of taking a trip such as this, he added: “You know, there’s a limit. You know, at some point, safety just is pure waste. I mean, if you just want to be safe, don’t get out of bed”.

“Don’t get in your car. Don’t do anything. At some point, you’re going to take some risk, and it really is a risk/reward question. I think I can do this just as safely by breaking the rules”.

The search continues.

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