AUV summary!

Storms and accidents on trade routes have caused millions of shipwrecks at sea , but they provide us excellent information about cultural trade routes from former civilizations. 

The large majority of shipwrecks are on deep high oceans and divers can only swim to certain depths. Besides, the use of tripulated submarines expeditions  are too expensive, except for a mini submarine: the automatic underwater vehicle (AUV). 

The AUV is inexpensive, small and efficient. Now, a team will use an AUV to explore an area of sea north Egypt, where it was believed that an important commercial port that existed about 4000 years ago is located.

if it doesnt have coherence, please correct me. (coherence,puntuation and grammar)

I have made some changes and rewording in order for it to be coherent. Let me know if you have any questions and I will gladly help you. :)

I would contact my loved ones and closed relatives in order to say farewell. Also, I would spend every second I'd have left in the company of those I cherish the most.

You are asking what you can use when you have a switch on you intentions or opinions, correct? If so, there is not a specific verb to describe this situation. You would have to properly say it: "I have changed my mind". Some common ways to also say the same thing are: "I had a change of heart" "I changed my plans" "I have changed my mind" When you are specifically referring to your intentions, you could say: "I had a change of heart" "I don't think like this anymore" Keep in mind that most of the time we will not use a generic expression, but instead we will provide the reason for why we have changed or behavior or plans.

Options 2 and 3 are correct, however option 4 is not. 4 -"Some words are impossible to be translated" You have used "of being" in a manner that is improper. You intended to use being as verb in the gerund, but in that case you would need a conjugated verb to be and a subject to be inflicting the action (to translate) over the object (the words). Not only the structure you used would not allow it, but it would change the meaning of this sentence. You would be basically saying that "a subject is being translated". Hope that helped. :)

I intend to travel to the USA.

Hi everyone! Today I will talk about a travel to The United States that I intend to make soon.
A lot of people have told me that The United States has good and bad things. I'm checking out all of these things in order to be ready before I go. I want to see famous cities like New York, Las Vegas, Miami and others. I know some rules about The United States and I know I need to keep those rules in my mind in order to / so I will not get into any trouble over there. In Brazil, we have a good view of The United States, but I know that it is not accurate, at least not completely.
What do you think about USA? Are you a native person?
(I'm practicing my english)

Points: your english is great. I have added some missing articles (The USA has an article in its name, just like The UK).  I have also replaced some words that I believe would reflect more accurately your intentions. Those are have underlined are options that I believe would be more grammatically suitable, but it does not mean it was necessarily wrong.

Keep up the good work!