Portugal's repeated interest in British ships leads into the subject of allied offers for obsolete submarines. Such a sale would be very risky in real life, although the precise danger is not explained in this exchange. That concern does not make the event implausible because used-submarine transfers have historical precedent. The example separates a hazardous procurement choice from one that navies have never actually made.
Notable Point · 1:18:43-1:19:21
Why selling old submarines is historically plausible
Allied offers to buy obsolete submarines feel risky, although such transfers have historical precedent.