I consider the diving also has many disadvantages

(1) The verb CONSIDER in English is a copula, i.e. it is followed by a noun object that is EQUAL TO a nominal concept (noun) or a characteristic (adjective). So you can say, for example, I consider my boss a friend. Here BOSS is the object of "consider" and FRIEND is the complement. So it means "my boss = my friend." So you can only consider something or someone TO BE, and not TO HAVE. (2) Also, DIVING has no article.

Thanks Uly, I've corrected my answer.

Very good, Tatiana : )