translation.en: So we had to chase this in the submersible for quite sometime, because the top speed of this fish is one knot, which was the top speed of the submersible.
translation.zh: 有些时候我们不得不提速潜艇来追赶它， 因为这种鱼的最高游速是每小时一海里， 也是潜艇的最高游速。