We’ve almost never deployed or collected our instruments without additional flotation of some kind. A raft helps us transport heavy and large equipment from shore, and when equipped with a dive flag, signal to others where we are. We’ve had to swim out quite far in many places – the beach at Nu’u bay is far from deep water, hydrophones needed to be distant from the boat traffic at Maliko gulch, and we needed to show where we were to the boats coming in and out of Kewalo basin.
Our first ‘vessel’ was the “Sea Hawk 300” – a toy inflatable boat complete with plastic oars we got for $30 (what a bargain!). Apart from its tendency to occasionally leak it was a great help, hauling equipment from the beach to dive sites and back. It even served as a real boat when Simon had a cold and followed Lauren as she snorkeled to retrieve the instruments at Electric Beach, Oahu.
We had a few problems with the sea hawk. We left the car keys inside while we were down which didn’t go well on one occasion when the waterproof plastic bag with the keys inside took flight over the side. If anyone ever finds a floating bag on a pacific beach with a new-looking Volkswagen keyfob inside (which should be in perfect working condition), its worth $370 when returned to Enterprise.
The line connecting the sea hawk to us was fairly thin and had the disconcerting tendency to break. This happened three times at Kahekili bay on Maui’s west coast. Luckily, each time the stiff tradewinds were blowing along shore. As soon as it was discovered that the boat was gone the drill was the same – everyone surfaced and swam to the beach, whoever got there first would dump their gear and run downwind. After running a kilometre in a full wetsuit and then walking back upwind with the sea hawk in tow several times, we upgraded the line to an anchor warp. It was hoped that the extra hassle of carrying a heavy line like that underwater would be offset by never having to retrieve the boat again. We were right about never having to retrieve the boat again, but wrong about the rope..
Our deployment at La Perouse Bay, southern Maui, involved a swim of a couple of hundred metres offshore into water between 10-20 m deep. The tradewinds were fairly strong this far from shore and we could feel them constantly tugging on the sea hawk while we were underwater with the heavy line clipped to our belts. During the last survey of the day we clipped the sea hawk to one of the anchors that was already screwed into the sand. When we came back…it was gone! The line hadn’t snapped. Instead, the spring loaded swivel snap had somehow come undone – something very difficult to replicate (as we tried many times) but possible under the right conditions. We surfaced as fast as we could (which was fairly slowly, as we had equipment and an ascent rate to watch) and looked for the boat. If it was close enough we could make a dash for it, or so I thought. I will never forget the view on the surface: a wild and windswept sea, a glowing sunset over Molokini, and the sea hawk flipping over and over wave crests far in the distance, forever freed from its anchor and on its way to the deep ocean via the Lanai channel. If it made it past Lanai, Molokini, and Maui, its three independent floatation chambers may mean that sea hawk will voyage over the north pacific gyre for many years.
Both of us were rather upset. It was sunset and we had to swim back to shore with all our stuff. We had become used to the convenience that sea hawk provided. What shall we do? We swam back to the beach and discussed/commiserated on the way home. Could we find an inexpensive replacement on Maui? Craigslist was consulted and sea hawk #2 (A.K.A. ‘the donut’) was found.
The donut is actually a ski tube (or ski biscuit in NZ). Bought for the humble sum of $25, it proved its worth the first time we used it – in choppy seas on Maui’s north shore where the sharp rocks might have pierced the thinner hull of the sea hawk.
Sometimes however, the distance between shore and where we want to put our equipment is just too far to swim. We have a permit to do our work in the marine reserve at Kealakekua bay on the Big Island, about 2 km from the nearest shore access. Although almost no-one swims, hundreds of kayakers make the trip every day to view the monument in the place where Captain Cook was killed and to snorkel the reef. We were tempted to use a kayak. But to rent or buy? The going rate for a double kayak is around $60 a day. We would need one here and at two other locations, so we would end up spending at least $300, which was roughly how much used double kayaks were going for on Craigslist. To cut a long story short we bought one – the “Pelican apex 13 twin”. Whether or not we save money depends on whether or not we can sell it in a couple of weeks!
Regardless, it works very well after a few quick mods (there were no porthole lids, so some real estate signs were sacrificed). The one exception was when we tried to take our scuba gear on board with us. With the tanks in the footwells, the centre of gravity is dangerously high. If you neatly put your mask away in the foot pocket of your fin (which sinks), its impossible to find everything on the bottom when the kayak tips over and spills all your gear! Luckily this occurred in a shallow safe place during our ‘sea
trial’ deployment at Puuhonua o Honaunau (Place of Refuge) Bay and a short swim to the car (to get a spare mask) meant that we recovered everything. We now tow the donut (with our dive gear inside) behind the kayak as a kind of trailer, which works very well. Needless to say we get quite a few comments from the other kayakers.