Chapter 393: Capturing Royal No. 7

As midnight approached, the sea was pitch black, and the submarine was coated with a special light-absorbing substance that rendered it invisible to the naked eye.

Although Su Lun couldn't see the exact shape of the submarine in the water, judging by the distribution of the Soulfire, one of the submarines was significantly longer than the other two, estimated to be over 130 meters in length.

Conventional combat submarines wouldn't be built so large, issues with turning radius, speed, and noise — larger size is problematic in many ways.

If one of the three submarines had such an exaggerated displacement, then it was most likely that so-called "secret mechanical research base." After all, mechanical workshops require a certain amount of space to install those large forging machines.

Its large size could only make sense for this purpose.