Use of Laser Range Module to Detect Obstacles in the Sea

If the titanic ship has been installed with a laser range module, then it would have scanned and mapped the iceberg from distant saving the gigantic ship from sinking. Titanic would have been saved from the disastrous accident that took hundreds of people with one mistake.

You must be thinking – how a laser range finder can save the ship and how it can analyze the obstacle from far away distance?