The military has called off the search for the seven Marines and one sailor who went missing after a deadly accident off the coast of San Diego on Thursday. The eight troops are now presumed dead after an exhaustive 40-hour search yielded no results. 

Fifteen Marines and one sailor were onboard an amphibious assault vehicle (AAV) off of San Clemente Island during routine training on Thursday when the AAV began taking on water around 5:45 p.m. The AAV was en route to a Navy ship. 

Eight of the 16 troops escaped the sinking vehicle. Of them, one Marine later died and two others are in critical condition in a nearby hospital. The remainder of the survivors are all fine and have been returned to the unit. 

Spokesmen for the 15th Marine Corps Expeditionary Unit (MEU) announced earlier on Sunday that the command determined that there was little likelihood that the missing service members have survived the accident. Next of kin have been notified. The Pentagon will probably release the names of the now-presumed dead servicemembers tomorrow.