EASTPORT — Two underwater map makers for the National Oceanic and Atmospheric Administration are finishing up a project to survey the bottom of Maine’s Cobscook Bay quicker than expected.

The survey done by Matt Andring and Nick Forfinski provides a complete and accurate representation of the bottom of the bay in Eastport, including a volcanic dike that bisects the center of the bay.

The mapping is part of an effort to learn why so many mariners have been lost in the bay in recent years. The Bangor Daily News says that on the last five years 16 fishermen have died in the bay.

Andring and Forfinski say they could not identify any single cause for all the fishing deaths.

Once they’re finished, the maps will be available online