A specialized U.S. Navy dive team and a group of Polish engineers have joined the recovery operation for the four U.S. soldiers who went missing in Lithuania during a training exercise, officials said Saturday. 

The new reinforcements will work to recover the armored vehicle M88A2 Hercules, which was found on Wednesday, March 26. The armored vehicle remains submerged under at least 15 feet of water, clay-like mud and silt, U.S. military officials said in a statement on Saturday. 

"We are going to use every resource available from all our countries to find our missing soldiers," Maj. Gen. Curtis Taylor, 1st Armored Division commanding general, said in the statement.

Recovery efforts will focus on removing water and mud from the area, shore up the ground around the site to support heavy equipment, and prepare the site for dive operations, officials said.