In this era, it is simply impossible for ordinary firearm-type thermal weapons to be used underwater, and they will be directly dumbfired.

But the harpoon gun is different, it is said that it is a gun, but in fact, this weapon does not use gunpowder at all.

His eyes swept over the tank that seemed to be like an oxygen tank, and Luo Ji probably already knew how this thing worked.

As for Luo Ji's name of 'harpoon gun', Ye Xuan, who was standing there, tilted his head and looked thoughtful.

It was obviously a first-time word for her, but the harpoon gun was a fitting name, so she simply called it so.

After entering the actual operation link, in order to see clearly, Luo Ji obviously wanted to follow them and dive into Mingjing Lake.

For this purpose, the people of the Ordnance Research Department have long prepared oxygen tanks and diving suits.

Although these devices had been built many years ago, Luo Ji was wearing them for the first time, and they were a little more bulky than expected.

It is not easy for normal humans to dive into the sea in this body, and it is not easy to do some simple underwater work, and it is really a bit difficult to expect them to be able to fight underwater.

In this way, the person in charge of operating the harpoon gun underwater is a soldier from the Lizardman Underwater Combat Unit.

Wearing a special combat uniform, the full set of harpoon guns and equipment have been put on, and after making all the preparations, everyone, including Luo Ji, dived into the water one after another.

In order to ensure the safety of His Majesty the Emperor, the people of the Ordnance Research Department also specially found two lizardman soldiers to protect them, one on the left and one on the right.

To be honest, this battle seems to be a bit of a fuss in Luo Ji's opinion.

Isn't he a swimmer? Not to mention that he could still drown while wearing a wetsuit and carrying an oxygen cylinder on his back?

After complaining a few words in his heart, Luo Ji, who was too lazy to continue to entangle, quickly shifted his attention to the scenery under the lake.

Today's weather is fine, it is a cloudless sunny day, so the visibility under the lake is also quite high.

From the surface of the lake, the scenery of Mingjing Lake can be said to be breathtaking, and under the surface of the lake, at a glance, it makes Luo Ji feel as if he is in another beautiful world of water blue.

Of course, at this time, he did not immerse himself in the beauty of the water, but forgot about business, and his whole attention quickly shifted to the lizardman soldier who was armed with a harpoon gun.

They didn't dive too deep, and even in this sunny day, once they dived too deep, the visibility under the water would begin to plummet, and finally they couldn't see their fingers, because the depth that the sun could reach was also limited, so the harpoon gun test could be maintained at an appropriate depth.

At this time, it can be clearly seen that in order to carry out this test, the personnel of the Ordnance Research Department have made a simple arrangement at the bottom of the lake in advance.

From a distance, Luo Ji saw at a glance that in the lake, there were two targets suspended there in a special way.

After diving to a certain depth, the lizardman soldier turned his head directly to look in the direction of Luo Ji.

In this regard, Luo Ji made a 'start' action quite simply.

The trials of the Harpoon gun began in earnest at this moment.

The lizardman soldier, apparently familiar with the operation beforehand, unscrewed the equipped gas cylinder quite neatly and filled the barrel with a special harpoon.

Then, quite neatly, he picked up the small harpoon gun, and after a little aiming, the trigger was pulled, and with a burst of bubbles, the special harpoon that flew out carried the water directly at the target that was closer.

Because it was in the water, during that whole process, Luo Ji could be said to see the trajectory of the harpoon gun clearly, with a different kind of beauty.

At the same time, the attack principle of a whole weapon is indeed the same as Luo Ji expected.

The firing principle of general thermal weapons is to propelle and launch according to the high-pressure gas produced after the rapid combustion of gunpowder, while the harpoon gun is more simply propelled by using the gas in the high-pressure gas cylinder!

This is the main reason why harpoon guns can be used underwater.

And just when Luo Ji was thinking like this, the harpoon that flew out had already hit the target in the distance.

Although the size of the target is not small, it can be hit, and it still shows considerable accuracy.

Then, while the lizardman soldier was reloading the harpoon, another lizardman had swam up to the target and picked it up.

It wasn't until the target was delivered to his eyes that Luo Ji finally saw that the wooden target, which was almost five centimeters thick, was directly pierced by this harpoon!

At the same time, it must be mentioned here that as a user of spell weapons, Luo Ji can clearly make a judgment that the blow of the harpoon just now did not trigger the spell spell on the gun at all!

Sure enough, after completing the loading of the second harpoon, the lizardman soldier turned around again and asked Luo Ji for instructions.

The target that is placed farther away is undoubtedly prepared for the next spell attack!

After getting Luo Ji's permission, on the harpoon gun that was picked up again, the water-blue magic crystal had already begun to flicker, and then, the entire circle of mystical spells around the water-based magic crystal lit up......

In the next second, the spearpoon that flew out directly shocked Luo Ji's heart.

"So fast!"

I saw that the moment the harpoon came out of the disembowel, the speed was amazingly fast, and the water flow that should have formed resistance seemed to have all become the help of the harpoon.

In the blink of an eye, the harpoon that flew out had already hit the target farther away with astonishing momentum.

There is no need to confirm the power, just the rate of fire, coupled with the visual attack range of more than three hundred meters, is enough to amaze Luo Ji.

It's a spell weapon, and it's really not said in terms of performance, according to the rate of fire and range distance, as long as the attack is launched while aiming at the target, the average fishman may not have time to react at all, and he must not be shot obediently?

As for power......

The underwater lizardman did the same as before, and quickly picked up the target.

The harpoon pierced the target again without incident.

However, Luo Ji, who was quite attentive, quickly discovered a problem, the thickness of the target seemed to be thinner......

Then, Luo Ji, who seemed to realize something, hurriedly motioned for everyone to return to the shore.

And after taking the target and confirming it twice, he clearly found that the thickness of this target was indeed not as good as the previous one.

If the previous one was more than five centimeters, then the thickness of this target should only be three centimeters.

However, this target is metallic......

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