Is it possible too scuba dive and swim down to the titanic shipwreck without a submarine?

No.

The limit for normal SCUBA diving on air is barely 30m (3 Bar pressure), and that for only a short time.

Diving deeper becomes very much more technical and hazardous, and the Titanic lies at about 3800m, far beyond any version of that. The pressure down there is about 380Bar (approx 5500lbs/in^2).

Nope. Way too deep

Did you miss the Oceangate mess???

Only if you want to get popped like a water balloon thrown against the wall.

Impossible!🤔

Too dangerous

No it's not. The Titanic is just too deep.

Did you forget about the crushed minisub last year?