Short Cruise Report, RV ATAIR, Cruise 067I041-1, Bremerhaven – Thybor?n – Aberdeen, 22 Jul – 14 Aug 2025 7 3. Narrative of Cruise 067I041-1 RV ATAIR departed from its berth at Labradorkai in Bremerhaven, Germany, on 22 July 2025, at 06:30 UTC, passing Bremerhaven Sleuth in order to start its cruise 067I041-1, the North Sea Summer Survey (NSSS) of 2025. The scientific mission of cruise 067I041-1 began that afternoon with a test station at the mouth of the Old Weser River. Continuous acquisition of vessel-mounted ADCP data commenced upon reaching station #002/GN003/ELBE1. The course was set west- wards, initially following the 54°N latitude line. On 23 July, the vessel entered the Dutch EEZ and subsequently worked at nine hydrographic stations (#005/GN007A to #013/GN013N). At station #008/GN009, the vessel turned south to reach the southernmost station of the cruise, which was located near the southern entrance to the North Sea (station #013/GN013N, reached on 24 July). Water intrusion into the main body of the thermosalinograph (TSG) at the start of the cruise had damaged the electronic connectors. The system was out of action until 12:18 UTC on 24 July, when it was repaired and data recording could resume. On 24 July, the vessel entered UK waters for the first time and worked on stations #014/GN014 to #018/GN009S, traveling north to return to 54°N to complete the measurements at this latitude. The first of four surface drifters, EDDY 2057, was deployed at the end of station #018/GN009S on 25 July. The western end of the 54°N section was reached at station #020/GN017A on 26 July. On the same day (26 July), measurements began at station #022/GN018A, located at the western end of the 55°N section. The course was then set towards the eastern end of the section. The second surface drifter, EDDY 2068, was deployed on station #024/GN018S on 26 July. Due to the presence of a large wind farm located on Dogger Bank, it was necessary to take a northward detour in order to reach the new station location #025/GN019N, which was visited for the first time in the summer of 2024. Shortly after completing station #026/GN019S on 27 July, the vessel left UK waters and entered Dutch waters again. On 28 July, the vessel reached the eastern end of the 55°N section (station #033/GN025) off the island of Sylt. The cruise was interrupted for a time of about three hours in order to pick up some scientific spare parts in List Harbour on the island of Sylt. The cruise then resumed, and the vessel headed north to continue measurements along the 56°N line in a westerly direction, encountering increasing wind speeds and a rising sea state (Fig. 2). On 28 July, the easternmost station of the 56°N section, #036/GN026, was sampled in Danish waters. The third surface drifter, EDDY 2060, was deployed on station #038/GN027 on 29 July. On 30 July, the westernmost station of the 56°N section, #046/GN033A, was sampled in British waters. On 31 July, the predicted weather conditions for the following days led to the decision to tempo- rarily skip the 57°N section, with the intention of resuming it at a later point in time. Thus, the vessel headed north and continued station work at 58°N in an easterly direction, starting with station #049/GN045D. On the way towards Norway, weather conditions deteriorated with wind speeds increasing to 7-8 Bf. The eastern end of the section was reached on 02 August at station #062/GN040, which was also the deepest station of the entire cruise (524 m). From 02 to 03 August, RV ATAIR followed 8°E south, crossing the Norwegian Trench (stations #063/GN040B to #065/GN039) and heading towards the port of Thybor?n in Denmark.