Great White Shark Attack -- Insane Video

A great white shark attacked a swimmer in Manhattan Beach CA and it was all caught on video.

The 7-foot shark was struggling on the wrong end of a fishing line near the pier. Shortly before the attack, the fisherman tried in vain for 40 minutes to reel the shark in ... the shark was agitated when some long- distance swimmers unwittingly crossed its path.

As video rolled ... the great white attacked one of the swimmers. People on the pier where the video was shot initially didn't realize someone was injured but soon thereafter it became apparent and they screamed at the people in the water to swim for their lives.

The attack victim sustained moderate injuries to his torso and is in stable condition.

The fisherman eventually cut the line.

TMZ Sports got this video shot last month of a 6-foot great white near the shoreline of Manhattan beach, as paddle boarders circled it.