On 10 January 2021, the Bulk Carrier "NAVIOS SUN" (GT 39,738 - DWT 76,619), immobilised due to tail shaft/malfunction about 50 miles SE from Kuriles Island, North Pacific. During the incident the vessel was on a voyage from Kushiro, Japan, to Vancouver, Canada, in ballast condition. 

On 11 January, Tsavliris was contracted to provide assistance and on 12 January despatched the ocean-going S/T "KOYO MARU" (BHP 10, 000 – BP 132,5) from her salvage station in Hakodate, Japan, together with a salvage master and two salvage officers on board, arriving at the casualty's position on 13 January. Tow connection was established and towage to Fuzhou, China (Fujian area) commenced. Due to the upcoming deteriorating weather conditions in the area, it was decided to take the Pacific route in a westerly direction. Due to adverse weather conditions (8 B, waves 3-4 m), the convoy proceeded to the E of Cape Erimo and circled around the sheltered area at reduced speed. On 14 January, the towage was resumed while agents were appointed by Tsavliris in order to provide assistance to both tug and tow. On 18 January, due to strong W winds (8-9 B, waves 4 m) it was decided to take shelter in Enshu Sea and the towage resumed on the next day despite strong winds.

On 27 January, the convoy arrived 72 miles from Fujian pilot station area. On the same day, due to heavy traffic in the area from fishing vessels and large fish farms, a wire fishing net entangled/fouled the towing wire at the bow/bulbous bow of the vessel. After disentangling the net and following instructions from the local port authorities and Salvor's local agent, the voyage plan was adjusted accordingly for the convoy to arrive at the Heiyanjiao safe area.
On 30 January, the convoy arrived at the rendezvous position with the assistance of two additional tugs namely the "BO HONG TUO 3" (BHP 3,600 - leading tug) and the "NING HONG TUO 6" (BHP 4,000 - steering tug).
On the same day, the "NAVIOS SUN" dropped port anchor at the designated/safe area as per port authority's instructions and the "KOYO MARU" provided standby services.
On 31 January, with the assistance of four powerful port tugs, the vessel was safely berthed at Fujian Huadong Shipyard and the operation was successfully completed.