This is underwater remember - the weight thing is a solved issue, just include flotation along its length and its effective weight is as low as you care to make

This is underwater remember - the weight thing is a solved issue, just include flotation along its length and its effective weight is as low as you care to make it. There are few strong currents in the Gulf - it is a source for the Gulf Stream, but internal currents are fairly weak compared with those dealt with regularly in the oceans.