The yellow color made the submarines look like research submarines.

She remembered the research submarine at the bottom of Titron.

Biologists diving in research submarines went after these fish with nets and baited traps.

Several major firms built small research submarines to explore the oceans.

In late July, the NR1 - a 145-foot-long research submarine carrying five crew members and two scientists - will take a closer look.

Construction started in 1939 on a small research submarine designated the V-80.

Last year, the Navy contributed its nuclear research submarine to the effort.

The exhibition includes a daily program of live and taped video broadcasts from robotic research submarines now exploring the canyon.

First, why did the Americans allow our man aboard one of their most sophisticated research submarines?

A French research submarine would make the return.