Su Lun really felt like he had struck gold.
Not only was Tanni one of the best sailing masters in Pirate City, but the ability he now displayed to "listen to the voices of sea creatures" was also a great help to the Dawn Group.
Otherwise, without realizing it, Su Lun would not have noticed that they were being watched.
The mechanical octopuses acted very covertly in the sea, as they possessed the soul fluctuations and some life characteristics of normal octopuses, making it difficult to distinguish them from regular octopuses unless seen with one's own eyes, even for practitioners with sensory abilities.
With these advantages, they were easily overlooked in the deep sea areas dense with marine life.
But as for the tracking,
with a little thought,
Su Lun knew that these octopuses were probably not originally after them but were more likely following that "Frost Moon Princess" Skadi.