First, a small armada of oil tankers emerged to help Russia beat sanctions. Now hundreds of fuel vessels are taking steps to hide where they’re going from prying eyes.

A record 311 mid-range ships were recently seen sailing without cargo or destination, according to Kpler data compiled by Bloomberg, compared to an average of 14 such ships at any given time prior to this year. Meanwhile just 33 empty vessels are signaling Russia, the lowest level on record and down from 103 at the beginning of the year. 

This shift is a sign that vessels may be forming a “dark fleet” to haul Russian fuel under the radar after the European Union banned it less than two weeks ago. More than 400,000 barrels a day of diesel used to flow from Russia to Europe, and traders and shippers are expected to find workarounds to sanctions to keep a large portion of it flowing to the global market.

    The jump in aimless empty vessels could also reflect shipowners trying to anticipate the region of highest demand in the reshuffling of Russian product.

    The cost to use fuel tankers has skyrocketed since the EU ban, as ships enter the dark fleet and become unavailable — and uninsured by European maritime service providers — for regular trade routes, such as moving gasoline from Europe to New York.