374 
meters; 500 black and white and an equal num- 
ber of color photographs were taken, some from 
the remote surface controlled stereo-camera, some 
from the submarine; 20 bathymetric profiles 
were run normal to the coast by the "Teritu” 
and numerous geological and biological speci- 
mens were collected from the terraces and 
escarpments by the various dredges and trawls. 
The following report summarizes these data and 
compares their relative merits for geological and 
biological reconnaissance surveys. 
AREA OF INVESTIGATION 
The area of investigation was chosen mainly 
with the intent of selecting oceanographic and 
meteorologic conditions that would be optimum 
for handling a small, research submarine. Since 
the submarine diving operations necessitated 
surface towing of the vehicle, and since the 
replenishment of compressed air, recharging of 
PACIFIC SCIENCE, Vol. XXII, July 1968 
the battery bank, and maintenance required 
moving alongside the mother ship, a leeward 
coast was necessary. Secondary requirements in 
the selection of the area of investigation were 
connected with the land-based logistical sup- 
port of the entire operation over a 10-day 
period. 
Because of the prevailing easterly tradewinds 
and the resulting near permanency of a lee coast 
along western Oahu, it was possible to meet the 
above requirements in an area of intensely inter- 
esting submarine features and a poorly known 
biota. Consequently a 1 4-kilometer length of 
coast along western Oahu, from Kaena Point to 
Kepuhi Point, was chosen for the reconnais- 
sance (Figs. 1 and 2). This area provided ideal 
lee operating conditions during November; it 
was within l/ 2 hour by boat from Pokai Bay, 
a replenishment harbor just to the south; it 
was a single isolated geological unit or cell in 
regard to the littoral circulation of sand; and 
Fig. 1. Location chart. 
