I watched it recently for the first time and I had to wonder if sequences happened out of order in the film for example - when they go to search for our two leads in the sub, they end up at the radioactive waste dump...which is the same place they get to when they attack the underwater base when they go to search for the two swimmers and for the missing scientist.

The movie never explains how the sub followed that particular track the first time, but we see them following a signal the second time - was all of this part of the same sequence?

Of course if it was intended to be a 3 part TV movie then maybe there's a lot of extraneous stuff that got cut sliming it to 80 minutes...