# Altı Üstü İstanbul broadcast and plot developments > Live situation record from CLSTR: https://clstr.news/situations/alt-st-istanbul-tv-broadcast-and-online-viewership > Updated: 2026-09-07T06:10:10.000Z. Sources: 19. Developments: 10. The Turkish drama Altı Üstü İstanbul continues to be filmed in historic Istanbul neighbourhoods, including Fatih, Balat, and Üsküdar, while utilizing upscale settings in Beşiktaş and Sarıyer. The series maintains strong digital performance on YouTube and airs on ATV. Following the dramatic events of episode 12—which included an armed attack during Hasan’s night, Sado being shot, a hostage crisis, and a shocking confession by Bayram at a wedding—the trailer for episode 13 has been released. The trailer has generated social media interest, particularly regarding the line ‘They seem to have missed Naz!’, hinting at new dangers. As episode 13 approaches, the plot has intensified with a medical crisis involving Naz. After collapsing in recent scenes, Naz has been diagnosed with liver failure and requires an urgent organ transplant. This development has sparked viewer speculation regarding whether actress Elçin Zehra İrem will leave the show. The narrative suggests Naz’s survival may depend on a potential organ donation from Melek, who is being forced into a medical procedure. Simultaneously, characters Fahriye and Soner are considering revealing long-held secrets to assist in saving Naz. Episode 13 is expected to air on 7 September 2026. ## Timeline ### 2026-09-07: Altı Üstü İstanbul plot intensifies with Naz's medical crisis The ATV series Altı Üstü İstanbul features critical plot developments as the character Naz faces a life-threatening liver failure, leaving her future in the show uncertain. 3 sources. https://clstr.news/cluster/alt-st-istanbul-plot-intensifies-with-nazs-medical-crisis ### 2026-08-31: Altı Üstü İstanbul releases trailer for episode 13 The trailer for the 13th episode of the ATV series ‘Altı Üstü İstanbul’ has been released, following a violent episode involving an armed attack and a hostage crisis. 4 sources. https://clstr.news/cluster/alt-st-istanbul-releases-trailer-for-episode-13 ### 2026-08-29: Ercan Reşit Demir joins cast of Altı Üstü İstanbul Ercan Reşit Demir joins the cast of the ATV series ‘Altı Üstü İstanbul’ as Dursun, the father of the character Sado, appearing in episode 13. 3 sources. https://clstr.news/cluster/ercan-reit-demir-joins-cast-of-alt-st-istanbul ### 2026-08-16: Altı Üstü İstanbul prepares for major plot shifts in episode 10 The upcoming tenth episode of the ATV series ‘Altı Üstü İstanbul’ features a major confession by Esra and growing romantic tension between characters Emir and Naz. 2 sources. https://clstr.news/cluster/alt-st-istanbul-prepares-for-major-plot-shifts-in-episode-10 ### 2026-08-03: Altı Üstü İstanbul episode 9 trailer still unreleased as series escalates conflict Altı Üstü İstanbul’s ninth‑episode trailer remains unavailable; episode eight aired with a deadly trap for Emir, escalating conflict and deepening his bond with Naz. 2 sources. https://clstr.news/cluster/alt-st-istanbul-episode-9-trailer-still-unreleased-as-series-escalates-conflict ### 2026-07-25: Altı Üstü İstanbul airs final episode as Uzay Sultan character gains focus Altı Üstü İstanbul aired its final episode on ATV, featuring Melek’s crisis and Hasan’s confession, while spotlighting the Uzay Sultan character played by Berk Ali Çatal. 2 sources. https://clstr.news/cluster/alt-st-istanbul-airs-final-episode-as-uzay-sultan-character-gains-focus ### 2026-07-12: Altı Üstü İstanbul reveals Emir's shocking truth about Melek Altı Üstü İstanbul spotlights actor Berk Ali Çatal as Uzay and unveils a plot twist where Emir learns Melek burned his shop, leading to a confrontation. 2 sources. https://clstr.news/cluster/alt-st-istanbul-reveals-emirs-shocking-truth-about-melek ### 2026-06-28: Altı Üstü İstanbul draws strong viewership as new episode fuels online buzz Altı Üstü İstanbul’s latest episodes boost viewership, with plot twists around Emir, Naz and Uzay Sultan, and actor Berk Ali Çatal’s performance drawing notable fan interest. 2 sources. https://clstr.news/cluster/alt-st-istanbul-draws-strong-viewership-as-new-episode-fuels-online-buzz ### 2026-06-23: Altı Üstü İstanbul airs Mondays on ATV as YouTube views top 8 million Altı Üstü İstanbul keeps its Monday slot on ATV while the second episode garners over 8 million YouTube views, marking a hit summer series in Turkey. 2 sources. https://clstr.news/cluster/alt-st-istanbul-airs-mondays-on-atv-as-youtube-views-top-8-million ### 2026-06-15: Altı Üstü İstanbul filming locations and YouTube release timing Altı Üstü İstanbul is filmed in historic Istanbul districts and upscale areas, airs on ATV Mondays, and is uploaded to YouTube shortly after broadcast with the same edit. 4 sources. https://clstr.news/cluster/alt-st-istanbul-series-filming-sites-and-youtube-release-schedule-revealed --- Cite as: Altı Üstü İstanbul broadcast and plot developments. CLSTR, https://clstr.news/situations/alt-st-istanbul-tv-broadcast-and-online-viewership