I can't load the video, so I'm assuming this is a deep sea salvage? The cost of any deep sea salvage is often prohibitive. Remember the nearly new million dollar Gunboat abandoned several years back? To the best of my knowledge, no one ever even attempted to recover her.
First you've actually got to find it, not quite as easy as it sounds, even with an approximate position. Then you must find it in weather that is conducive to attaching a tow line (if the boat even has a point that strong; if not you'll have to build one), or standby until the weather moderates.
Next, always the fun part, you begin to tow a vessel that has her own mind on what direction she wants to go, and often it isn't the same one as the tow. If possible, you can put someone on the wheel of the towed vessel, but that's pretty risky if the weather goes to sh*t and you can't recover those crew members.
A lot of times the tow line will break or the strong point you've attached to isn't as strong as you had hoped. As this often happens in bad weather, you'll once again have to stand by until the weather moderates to hook up again. On a long tow, this can happen over and over again.
Quite often, even with big ships, the cost of salvage can easily far exceed the value of the vessel and even her cargo. Then there are the legal hassles of being in possession of a vessel you don't own. Almost as much fun as a broken tow line....
