A Chinese navy warship armed with what looks like a mounted electromagnetic railgun has apparently set sail, possibly for testing in the open ocean.

The Type 072II Yuting-class tank landing ship Haiyangshan and its weapon were spotted along the Yangtze River at the Wuchang Shipyard in Wuhan earlier this year.

The latest photos of the test bed ship, which appeared on social media a few days ago, show the ship mounted with the suspected railgun on the vessel as it roams the high seas, Task & Purpose reported.

What the hell is this? pic.twitter.com/sQDAsHd7A3 — dafeng cao (@dafengcao) January 31, 2018

Long time no see, the railgun test ship is spotted undergoing sea trials these days. pic.twitter.com/WdxXkyYWrF — dafeng cao (@dafengcao) December 29, 2018

Chinese media outlets, such as the state-affiliated Global Times, revealed in March - nearly two months after the first pictures of what was dubbed the "Yangtze River Monster" showed up online - that the Chinese People's Liberation Army Navy is "making notable achievements on advanced weapons, including sea tests of electromagnetic railguns."

China is expected to field warship-mounted electromagnetic railguns with the ability to fire high-speed projectiles at targets up to 124 miles (200 kilometers) away by 2025, CNBC reported in June, citing US defence sources with direct knowledge of the latest military intelligence reports on China's new naval weapon.

China's railgun was first seen in 2011 and first tested three years later, according to CNBC. The Chinese military is believed to have successfully mounted the weapon on a navy warship for the first time toward the end of last year, when sea trials are suspected to have first started.

While conventional guns rely on gunpowder to propel projectiles forward, railguns use electromagnetic energy to hurl projectiles at targets downrange at huge speeds, roughly 1.6 miles per second (2.6 kilometers per second), making these weapons desirable next-generation combat systems.

Railguns require significant amounts of power, among other challenging demands. Whether or not China has managed to overcome these developmental issues remains to be seen.

China appears to be making progress as it moves toward possibly mounting railguns on combat-ready warships, such as the new Type 055 stealth destroyers, rather than test bed ships like the Haiyangshan. The US military, on the other hand, has yet to put the powerful gun on a naval vessel even though railgun development began over a decade ago.

It is, however, unclear which country is leading the charge on this new technology, as very little is publicly known about China's railgun or the testing process. In the US, there is speculation that the Zumwalt-class destroyers could eventually feature railguns, a possible alternative to the Advanced Gun System guns that the Navy might end up scrapping.

The destroyer is "going to be a candidate for any advanced weapon system that we develop," Vice Admiral William Merz, the deputy chief of naval operations for warfare systems, told the Senate Armed Services seapower subcommittee last month.

This article was originally published by Business Insider.

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