low oil pressure in a chamber that protects part of the bluefin-21's electronics. they say it was quickly fixed and the bluefin was sent back down. but it still cost about five hours of search time. on monday, the bluefin cut short a mission on its own when it started to go beyond range. that time, it finished its search. >> it is troubling when we have all of our eggs in one basket and that basket is operating at the very edge of the parameters. >> reporter: that leads people to question why the bluefin is the only device searching in the indian ocean. there are more suitable vehicles with better depth capability. the remus 6,000 can go deeper, and the u.s. navy has those but says they are deployed on missions and are not available. there is also the orion, a towed vehicle that has side scan