-- A bra factory refers generically to a target that is not of the highest priority but whose destruction inconveniences the enemy.
-- The indiscretion rate is the proportion of time submarine must spend near the surface drawing air, as a function of its speed. The American force is all nuclear and therefore has an effective indiscretion rate of zero, whereas the Soviet force is part diesel/electric and must sometimes be indiscrete.
-- Hotel power is the output necessary to keep the submarine's internal systems functioning, apart from the energy used to move it through the water, so the higher the hotel power, the higher the indiscretion rate, ceteribus paribus.