1 ATM Sub Question

[Jonathan Wallace <jon@whoweb.com>]

I have a question regarding water displacement and the
weight needed to effectively submerge a submersible.
Does the total vehicle weight needed to become
neutrally bouyant equal the weight of water displaced
by the vehicle?  (I understand that a sub can penetrate
the water when somewhat positively bouyant)

So if I calculate that my sub displaces X cubic feet
of water and then multiply X by the weight of 1 cubic
foot of water, is that how much my sub needs to weigh
to submerge?

Jon