OOC: Read the appropriate rule section, but not clear if it is ok for Lars to run/swim all out and move at quadruple speed. (4 x 15 ft = 60 ft) If not, assume Lars moves only 30 feet. (I placed him 60 feet closer than his starting location.)
Lars takes moment to take his bearings, and then starts swimming/pushing off the bottom, moving as quickly as he can under the circumstances.