They will do a thorough sonar scan of the area, then send a remotely operated vehicle.

The new high-resolution sonar scans have shown that at some point during the next 250,000 years, this natural dam broke.

The group searched about 27 square miles of the lagoon and sonar scans identified debris at 61 sites.

Scientists have previously discovered channels running along ocean floors, based on sonar scanning.

In 2003, scientists conducted a series of sonar scans to determine local fish populations.