S16·E17 Silent Service

Episode recap

Task: Write a 280-380 word episode recap for NCIS S16E17 (Silent Service).
Constraint 1: Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
Constraint 2: Never invent/guess titles, names, dates, etc.
Constraint 3: If details are missing, omit them rather than guessing.
Constraint 4: Write original, neutral, encyclopedic prose in plain text.
Constraint 5: No markdown, no asterisks, no headings, no bullet points.
Constraint 6: Length must be 280-380 words.
SYNOPSIS: Director Vance is notified by the Pentagon that the nuclear submarine Gibbs and Bishop are aboard to conduct a murder investigation has gone radio silent.
SOURCES:
[1] TMDB: NCIS (2003), TV-14, Crime, Drama, Action & Adventure. Overview mentions murder, espionage, terrorism, stolen submarines.
[2] IMDb: Created by Donald P. Bellisario, Don McGill. Stars Sean Murray, David McCallum, Mark Harmon, Brian Dietzen. Follows Major Case Response Team investigating cases connected to US Navy and Marines Corps.
[3] Deadline: Mentions JAG, Pauley Perrette (Abby).
[4] Variety: Mentions Sean Murray, Brian Dietzen, Rocky Carroll.
[5] Wikipedia: American military police procedural, first installment of NCIS media franchise, showrunner Steven D. Binder.
Episode: S16E17 (Silent Service).
Plot: Director Vance is notified by the Pentagon that a nuclear submarine has gone radio silent. Gibbs and Bishop are aboard the submarine to conduct a murder investigation.
The synopsis is extremely sparse. It only provides one specific plot point: Director Vance is notified by the Pentagon that a nuclear submarine, which Gibbs and Bishop are aboard to conduct a murder investigation, has gone radio silent.
The sources provide general series information: NCIS is a military police procedural created by Donald P. Bellisario and Don McGill. It follows the Major Case Response Team of the NCIS as they investigate criminal cases connected to the US Navy and Marines Corps personnel and their families. The series is part of a media franchise and is helmed by showrunner Steven D. Binder.
The prompt asks for a 280-380 word recap.
Problem: The provided synopsis is only about 30 words. The sources contain no additional plot details for this specific episode.
Constraint Check: "If the synopsis is sparse, stay concise rather than guessing." AND "Write a grounded 280-380 word episode recap".
Conflict: I cannot reach 280 words without inventing facts or repeating