Seute Deern (Low German for "Sweet girl") is a wooden, gaff-rigged ketch built as the cargo ship Havet (Danish for "The Sea") in Svendborg, Denmark in 1939 for Captain Karl Lorenzen.

The ship was built and named Havet in 1939 at the J. Ring-Andersen shipyard in Svendborg, Denmark, for Captain Karl M. Lorenzen.

[1] The ship was sold in 1957 to the Danish company D/S Ocean, part of the Lauritzen Group, Copenhagen, and renamed Noona Dan.

Noona Dan and the expedition left Copenhagen on 10 April 1961 under command of captain Jørgen Kaas Narup.

Four researchers shared the role as expedition leader consecutively: Børge Petersen, Mogens Køie, Finn Salomonsen and Torben Wolff.

[2] In October 1961 the expedition suffered a loss on Tawitawi, as the ornithologist and taxidermist Erik Petersen died from an allergic reaction to an insect bite.