u guys r saying that the berg will need constant depth monitoring when submerged. but i thought that, if it is only just slightly heavy enough to submerge, wouldnt it just sink to a consistant depth? the water pressure gets higher as u go down, so i figured it would only go so far.
While pressure gets higher the lower you go, yes, water DENSITY barely lowers at all. Water, pure water, is non-compressible meaning that it never loses volume under compression. Sea water has salt and other impurities which cause it to compress SLIGHTLY but not much. The difference between 1 foot deep and 1 mile deep is only about 2.8%. In effect, unless you can be VERY exact in your balast systems, you risk accidentally finding neutral buoyancy at the bottom of the Mariana Trench.
Thus, your best system will be to either
1) Bring on just enough ballast to go barely below neutral buoyancy and have some surface floaters at the end of 25 foot long lines to “catch” you, or
2) Bring on just enough ballast to get to slightly above neutral boyancy, so that the bergstead still wants to float to the surface, and have a winch system to pull the bergstead down. This would require an expensive winch, but it wouldnt have to be super strong – just strong enough to pull the last ton or so of buyoancy.
Both systems have their pros and cons. There are probably others Im missing, too.
the winch system is cool, but that would require soooo much electrical energy to drag the berg against the current possibly several kilometers. its hard for me to really see that happening.
but the floaters are not a bad idea at all. i was already thinking about the need for a flexible vent tube for air, and also some sort of reciever for satellite communications. i got a lot to learn about how submarines communicate during a storm. but certainly, there could be a few floaters incorporated that help the berg stay afloat. that is something that will need to be investigated with a submersible prototype.