The 27th built a PT boat base, an LCT floating drydock and slipway, and roads. Ship repair work continues at the Garvel Drydock in Greenock's Great Harbour. The submarines can easily be repaired and serviced in the Tandanor drydock facility. The ship was seriously damaged and had to be repaired in drydock. "Ohio" entered drydock, beginning a 36-month refueling and conversion overhaul. A number are preserved as museum ships, either afloat or in drydock. The "HMB-1" was refitted at Treasure Island for service as a covered drydock. The collision caused damage necessitating another trip to the drydock in Tsingtao. She entered the auxiliary floating drydock to be inspected. Most ships, however, require trips to special facilities such as a drydock at regular intervals. In 1965 the factory opened a 27000-ton floating drydock. She then entered drydock for periodic maintenance. The keel blocks in the drydock were set up especially to support this curve. Many canal boats were sent in need of repair to Francis Meloling's Drydock. Canadian Vickers ordered the construction of a large floating drydock, which was opened in 1912.